CN114809448A - Template-free assembled UHPC-recycled concrete composite column and construction method - Google Patents
Template-free assembled UHPC-recycled concrete composite column and construction method Download PDFInfo
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- CN114809448A CN114809448A CN202210410544.XA CN202210410544A CN114809448A CN 114809448 A CN114809448 A CN 114809448A CN 202210410544 A CN202210410544 A CN 202210410544A CN 114809448 A CN114809448 A CN 114809448A
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- 239000004567 concrete Substances 0.000 title claims abstract description 87
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 316
- 239000010959 steel Substances 0.000 claims abstract description 316
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 37
- 230000002787 reinforcement Effects 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 26
- 238000013461 design Methods 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 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
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 238000004873 anchoring Methods 0.000 description 5
- 230000007774 longterm Effects 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
- 238000010008 shearing Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 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
- 239000012761 high-performance material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
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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
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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
- E04C5/02—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
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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
- 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
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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
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/122—Machines for joining reinforcing bars
- E04G21/123—Wire twisting tools
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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
- E04G21/14—Conveying or assembling building elements
Abstract
The invention provides a template-free fabricated UHPC-recycled concrete composite column and a construction method thereof, belonging to the technical field of fabricated concrete structures. The method solves the problems of how to strengthen the node connection of the prefabricated concrete structure and create a closed environment for the recycled aggregate when the recycled aggregate is applied to the prefabricated concrete structure. Through the node of rationally applying steel construction reinforcement assembled concrete structure for connected node reaches the designing requirement of "strong node", through prefabricated Ultra High Performance Concrete (UHPC) shell and cast-in-place recycled concrete post core, airtight environment is created for recycled concrete, realize reinforcing bar and steel node through reasonable setting structure, the reliable connection of steel node and steel node, improve the cohesiveness ability of nuclear core area concrete and steel node through setting up the hoop rib, whole component need not the template, connect simply, can effectively improve the efficiency of construction.
Description
Technical Field
The invention belongs to the technical field of fabricated concrete structures, and particularly relates to a template-free fabricated UHPC-recycled concrete composite column and a construction method thereof.
Background
The prefabricated concrete structure is one of the important directions of the development of the building structure in China, has the advantages of improving and ensuring the engineering quality, improving the production efficiency, reducing the construction cost, saving energy, protecting environment and the like, and has wide development space. The common connection modes of the prefabricated concrete structure mainly comprise sleeve grouting connection, spiral stirrup grout anchor lap joint and corrugated pipe grout anchor lap joint, but the connection is difficult to meet the design requirement of 'strong node and strong anchoring' and even becomes the weak point of the structure.
On the other hand, a large amount of building solid waste is generated in the process of modifying and dismantling the existing building, statistics shows that the yield of waste concrete in China exceeds 30 hundred million tons in 2020, a new challenge is provided for the sustainable development of the building industry, and the recycled aggregate prepared from the building solid waste and the industrial solid waste is produced at the same time. Research shows that the recycled aggregates have high porosity and water absorption rate, absorb water in the concrete mixing process, release water in the cement hydration process and supplement water in capillary holes in time, and the effect is called internal curing effect. The self-drying, self-shrinkage and basic creep of the concrete are all improved by the internal curing effect of the recycled aggregate, and the recycled aggregate is more scientific and reasonable to apply in a closed environment.
In conclusion, the application of the recycled aggregate to the fabricated concrete structure can consume a large amount of building solid waste and industrial solid waste, but how to strengthen the node connection of the fabricated concrete structure and create a closed environment for the recycled aggregate becomes a working difficulty which needs to be solved urgently.
Disclosure of Invention
In view of the above, the present invention is directed to a template-free assembled UHPC-recycled concrete composite column and a construction method thereof, so as to solve the above two problems of the background art. Through the node of rationally applying steel construction reinforcement assembled concrete structure for connected node reaches the designing requirement of "strong node", through prefabricated Ultra High Performance Concrete (UHPC) shell and cast-in-place recycled concrete post core, airtight environment is created for recycled concrete, realize reinforcing bar and steel node through reasonable setting structure, the reliable connection of steel node and steel node, improve the cohesiveness ability of nuclear core area concrete and steel node through setting up the hoop rib, whole component need not the template, connect simply, can effectively improve the efficiency of construction.
In order to achieve the purpose, the invention adopts the following technical scheme: a construction method of a 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 size design, welding the short inner steel pipes, the long outer steel pipes and the circumferential ribs into the upper parts of the steel joints, and welding the long inner steel pipes, the short outer steel pipes and the circumferential ribs into the lower parts of the steel joints;
(2) prefabricating a UHPC shell: binding or spot-welding a plurality of longitudinal steel bars and a plurality of stirrups into a steel reinforcement cage according to the design, respectively welding the upper part of each steel node and the lower part of each steel node at two ends of the steel reinforcement cage, welding the end parts of the longitudinal steel bars with circumferential ribs, welding the outer surfaces of the longitudinal steel bars with the inner surface of an inner steel pipe, welding the upper surfaces of the stirrups with the cross section of the inner steel pipe, pouring a UHPC shell at the position of the steel reinforcement cage according to the design thickness, and maintaining to the design strength;
(3) connecting steel nodes: transporting a plurality of prefabricated superposed columns to a construction site, inserting the upper parts of the steel joints of the superposed columns into the lower parts of the steel joints, enabling the short inner steel pipes to be in contact with the long inner steel pipes by adjusting angles, enabling the concave-convex shapes of the long outer steel pipes and the short outer steel pipes to be mutually occluded, and welding and connecting the concave-convex shapes at the concave-convex occlusion positions;
(4) pouring a recycled concrete core: and (4) densely pouring the recycled concrete core in the UHPC shell, and continuing to perform the next working procedure after the recycled concrete core reaches the designed 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, an 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 ribs are positioned on the inner surface of the short inner steel pipe, and the short inner steel pipe, the long outer steel pipe and the short inner steel pipe are welded to form the upper part of a 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 ribs are 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 ribs are welded to form the lower part of the steel node; and binding or spot-welding a plurality of longitudinal steel bars and a plurality of stirrups into a steel reinforcement cage, respectively welding the upper part and the lower part of the steel joint at two ends of the steel reinforcement cage, positioning the UHPC shell at the position of the steel reinforcement cage, and positioning the recycled concrete core inside the UHPC shell, the short inner steel pipe and the long inner steel pipe.
Furthermore, the joint of the long outer steel pipe and the short outer steel pipe is in a mutually meshed concave-convex shape.
Further, the steel strength grade 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 is not lower than Q355.
Furthermore, 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 diameter of the longitudinal steel bar.
Furthermore, the thickness of the circumferential rib is not less than the diameter of the longitudinal steel bar, and the width of the circumferential rib is not less than 1.5 times of the diameter of the longitudinal steel bar.
Furthermore, the distance between the circumferential rib and the edge of the inner steel pipe is not less than the anchoring length of the longitudinal steel bar, the end part of the longitudinal steel bar is 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.
Furthermore, the recycled concrete core is recycled concrete mixed with recycled aggregate made of waste concrete or industrial tailings, or internally cured concrete mixed with super absorbent resin material or lightweight aggregate.
Compared with the prior art, the connecting mode of the traditional assembled concrete column is improved by adopting the steel structure nodes, the traditional reinforced concrete column is improved into a superposed column of a prefabricated UHPC shell and a cast-in-place recycled concrete column core, the integrity of the steel bars and the steel nodes, the steel nodes and the steel nodes is strengthened through reasonable construction, and the bonding performance of the concrete and the steel nodes in the core area is improved through arranging the annular ribs. In summary, the fabricated hybrid column has the following advantages:
(1) high-performance materials are reasonably utilized. The structural nodes are not only the crossed joints of the upper and lower frame columns, the frame beams and the floor slab, but also key points of the seismic fortification of the building structure, and steel structures are arranged at the nodes to enhance the rigidity and the bearing capacity of the nodes; the outer frame column has the largest outside stress of the cross section under the action of bending moment, and the shell of the superposed column is UHPC with ultrahigh strength to bear tensile force or pressure, so that the performance of a high-strength material is fully exerted.
(2) The steel structure has good stress performance. The steel structure node comprises steel pipe, long outer steel pipe, long inner steel pipe, short outer steel pipe and hoop rib in short, with interior steel pipe nestification form good shear resistance in outer steel pipe, set up outer steel pipe junction into the concave-convex interlock mouth, strengthen the antitorque ability on the one hand, on the other hand extension welding seam length is in order to increase tensile or bending resistance.
(3) Effectively improve the long-term deformation and durability of the component. The UHPC shell on the outer side of the superposed column is prefabricated in a factory, the early-stage shrinkage deformation of concrete is basically finished, and a compact crack-free UHPC shell is formed, so that the service life and the durability of the structure are improved, a closed environment is provided for recycled concrete, and the long-term deformation such as self-generated shrinkage, basic creep and the like of a member is effectively improved due to the internal curing effect of recycled aggregate.
(4) Reliable connection and good member integrity. The end part of the longitudinal steel bar is welded with the circumferential rib, the side surface of the longitudinal steel bar is welded with the inner surface of the inner steel pipe, and the surface of the stirrup is welded with the section of the inner steel pipe, so that the steel node and the steel reinforcement cage are reliably connected; the steel node outer steel pipe 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 circumferential ribs, and the effective transmission of the shearing force at the nodes is realized.
(5) The connection is convenient, and the construction efficiency is high. And (3) prefabricating steel nodes and a UHPC shell of the superposed column in a factory, transporting the superposed column to a construction site, nesting and welding the steel nodes to complete node connection, and finally pouring a recycled concrete core to complete construction. Compare in traditional connected mode high-efficient swift more, will improve the efficiency of construction greatly.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic perspective view showing the internal structure of a template-free fabricated UHPC-recycled concrete composite column according to the present invention;
fig. 2 is a schematic perspective view of the fabricated UHPC-recycled concrete composite column;
description of the figure code: 1-short inner steel tube; 2-lengthening the outer steel pipe; 3-lengthening the inner steel pipe; 4-short outer steel tube; 5-circumferential ribs; 6-longitudinal steel bars; 7-stirrup; 8-UHPC shell; 9-recycled concrete core.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments.
First embodiment, referring to fig. 1-2 to describe this embodiment, a template-free assembled UHPC-recycled concrete composite column includes a short inner steel tube 1, a long outer steel tube 2, a long inner steel tube 3, a short outer steel tube 4, a plurality of circumferential ribs 5, a plurality of longitudinal steel bars 6, a plurality of stirrups 7, a UHPC outer 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 short inner 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 ribs 5 are positioned on the inner surface of the long inner steel pipe 3, and the three are welded to form the lower part of a steel node; a plurality of longitudinal reinforcements 6 and a plurality of stirrups 7 are bound or spot-welded to form a 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 reinforcement cage, the UHPC shell 8 is positioned at the position of the reinforcement cage, and the recycled concrete core 9 is positioned inside the UHPC shell 8, the short inner steel pipe 1 and the long inner steel pipe 3.
The invention designs the upper part and the lower part of a steel node, the structural node is not only the crossed joint of an upper frame column, a lower frame beam and a floor slab, but also a key point of the earthquake resistance of a building structure, and the steel structure is arranged at the node to enhance the rigidity and the bearing capacity of the node; the outer frame column has the largest outside stress of the cross section under the action of bending moment, and the shell of the superposed column is UHPC with ultrahigh strength to bear tensile force or pressure, so that the performance of a high-strength material is fully exerted.
The steel structure node comprises short steel pipe 1, long outer steel pipe 2, long inner steel pipe 3, short outer steel pipe 4 and hoop rib 5, steel pipe in short steel pipe 1 constitutes with long inner steel pipe 3, and outer steel pipe is constituteed with short outer steel pipe 4 to long outer steel pipe 2, forms good shear resistance with inner steel pipe nestification in outer steel pipe, sets up outer steel pipe junction into unsmooth formula interlock mouth, strengthens torsion resistance on the one hand, and on the other hand extension welding seam length is in order to increase tensile or bending resistance.
And 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. It is necessary to achieve strength matching in consideration of the strength of the longitudinal reinforcing bars 6, and thus the strength is generally not lower than Q355.
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 less than 2/3 of the diameter of the longitudinal steel bar 6. As the main force transmission component of the node, 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 directly relate to the safety of the node, firstly, the reliable connection of the longitudinal steel bars 6 of the upper column and the lower column of the node 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 strengthened to 2/3 of the diameter of the longitudinal steel bar 6 in consideration of the unfavorable working condition that the longitudinal steel bar 6 is likely to generate local tension and compression in an anchoring area, so that the stress capability, the anti-seismic performance and the supporting effect during construction of the node are fully ensured.
The thickness of the circumferential ribs 5 is not less than the diameter of the longitudinal steel bars 6, and the width of the circumferential ribs 5 is not less than 1.5 times of the diameter of the longitudinal steel bars 6. The thicker circumferential rib 5 has higher rigidity and stronger shearing resistance, the design of the thickness of the circumferential rib 5 can bear the concentrated force transmitted by the longitudinal steel bar 6 and can reliably transmit the concentrated force to the steel node, and the design of the width of the circumferential rib 5 can facilitate the welding connection construction with the joint of the longitudinal steel bar 6 and also can strengthen the bonding performance with the recycled concrete core.
The position of the circumferential rib 5 is not less than the anchoring length of the longitudinal steel bar 6 from the edge of the short inner steel pipe 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 pipe. The reliable anchoring of the longitudinal reinforcement 6 is fully ensured.
And the upper surface of the stirrup 7 is welded with the edge of the short inner steel pipe 1. The end part of the longitudinal steel bar 6 is welded with the circumferential rib 5, the side surface of the longitudinal steel bar 6 is welded with the inner surface of the inner steel pipe, and the surface of the stirrup 7 is welded with the cross section of the inner steel pipe, so that the steel node and the steel reinforcement cage are reliably connected; the steel node outer steel pipe is welded to realize the reliable connection between the steel node and the steel node; the bonding performance of the concrete and the steel node in the core area is improved by arranging the circumferential rib 5, and the effective transmission of the 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 surface of the outer steel pipe of the node, so that the connection between the component and the node is neat and attractive, and the subsequent decoration engineering construction is not influenced; 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 UHPC shell 8 is reliably connected with a steel bar cage, and good stress capacity 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. Under 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 the cement and reducing shrinkage creep deformation are achieved.
The invention reasonably designs the nodes of the steel structure reinforced fabricated concrete structure, so that the connection nodes meet the design requirement of 'strong nodes', improves the traditional reinforced concrete column into a superposed column of a prefabricated UHPC shell and a cast-in-place recycled concrete column core, reasonably constructs the integrity of the reinforced steel bars and the steel nodes, and the steel nodes, improves the bonding performance of the concrete and the steel nodes in the core area by arranging the circumferential ribs, has no need of templates for the whole component, is simple to connect, and can effectively improve the construction efficiency. The assembled superposed column fully exerts the performance of high-strength materials, can effectively improve the long-term deformation and durability of 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 size design, welding the short inner steel pipes 1, the long outer steel pipes 2 and the circumferential ribs 5 into the upper parts of steel nodes respectively, and welding the long inner steel pipes 3, the short outer steel pipes 4 and the circumferential ribs 5 into the lower parts of the steel nodes respectively;
(2) prefabricating a 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 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 part of the longitudinal steel bar 6 is welded with the circumferential rib 5, the outer surface of the longitudinal steel bar 6 is welded with the inner surface of the inner steel pipe, the upper surface of the stirrups 7 is welded with the section of the inner steel pipe, pouring a UHPC shell 8 at the position of the steel reinforcement cage according to the designed thickness, and maintaining to the designed strength;
(3) connecting steel nodes: transporting a plurality of prefabricated superposed columns to a construction site, inserting the upper parts of steel joints of the superposed columns into the lower parts of the steel joints, enabling the short inner steel pipes 1 to be in contact with the long inner steel pipes 3 by adjusting angles, enabling the concave-convex shapes of the long outer steel pipes 2 and the short outer steel pipes 4 to be mutually occluded, and welding and connecting the concave-convex shapes at the concave-convex occlusion positions;
(4) pouring a recycled concrete core: and (3) densely pouring the recycled concrete core 9 in the UHPC shell, and continuing to perform the next working procedure after the recycled concrete core 9 reaches the design strength.
The UHPC shell on the outer side of the superposed column is prefabricated in a factory, the early-stage shrinkage deformation of concrete is basically finished, and a compact crack-free UHPC shell is formed, so that the service life and the durability of the structure are improved, a closed environment is provided for recycled concrete, and the long-term deformation such as self-generated shrinkage, basic creep and the like of a member is effectively improved due to the internal curing effect of recycled aggregate.
The invention adopts the steel structure node to improve the traditional connection mode of the assembled concrete column, 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 a circumferential rib 5, and the steel structure node has good stress performance. The traditional reinforced concrete column is improved into a superposed column of a prefabricated UHPC shell and a cast-in-place recycled concrete column core, and the long-term deformation and durability of the member are effectively improved. Through the reasonable connection degree of constructing reinforcing steel bar and steel node, steel node and steel node, improve nuclear region concrete and steel node's cohesiveness ability through setting up the hoop rib, improve the wholeness of component. The steel structure node is compared in traditional connected mode high-efficient swift more, will improve the efficiency of construction greatly.
The embodiments of the invention disclosed above are intended merely to aid in the explanation of 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 utilize the invention.
Claims (10)
1. A construction method of a template-free assembled UHPC-recycled concrete composite column is characterized by comprising 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 size design, welding the short inner steel pipes (1), the long outer steel pipes (2) and the circumferential ribs (5) into the upper parts of the steel joints, and welding the long inner steel pipes (3), the short outer steel pipes (4) and the circumferential ribs (5) into the lower parts of the steel joints;
(2) prefabricating a 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 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 surface of the longitudinal steel bars (6) is welded with the inner surface of the inner steel pipe, the upper surface of the stirrups (7) is welded with the cross section of the inner steel pipe, pouring a UHPC shell (8) at the position of the steel reinforcement cage according to the design thickness, and maintaining to the design strength;
(3) connecting steel nodes: transporting a plurality of prefabricated superposed columns to a construction site, inserting the upper parts of steel joints of the superposed columns into the lower parts of the steel joints, enabling the short inner steel pipes (1) to be in contact with the long inner steel pipes (3) by adjusting angles, enabling the concave-convex shapes of the long outer steel pipes (2) and the short outer steel pipes (4) to be mutually occluded, and welding and connecting the concave-convex shapes at the concave-convex occlusion positions;
(4) pouring a recycled concrete core: and densely pouring the recycled concrete core (9) in the UHPC shell, and continuing to perform the next working procedure after the recycled concrete core (9) reaches the designed strength.
2. A template-free fabricated UHPC-recycled concrete composite post as recited in claim 1, wherein: the steel pipe 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 circumferential rib 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 three are welded to form the lower part of the steel node; a plurality of longitudinal steel bars (6) and a plurality of stirrups (7) are bound or spot-welded to form 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, a UHPC shell (8) is positioned at the position of the steel reinforcement cage, and a recycled concrete core (9) is positioned inside the UHPC shell (8), the short inner steel pipe (1) and the long inner steel pipe (3).
3. The template-free assembled UHPC-recycled concrete composite column of claim 2, wherein: the joint of the long outer steel pipe (2) and the short outer steel pipe (4) is in a mutually meshed concave-convex shape.
4. The template-free assembled UHPC-recycled concrete composite column according to claim 2 or 3, wherein: and 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.
5. The template-free assembled UHPC-recycled concrete composite column according to claim 2 or 3, wherein: 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 less than 2/3 of the diameter of the longitudinal steel bar (6).
6. The template-free assembled UHPC-recycled concrete composite column of claim 2, wherein: the thickness of the circumferential rib (5) is not less than the diameter of the longitudinal steel bar (6), and the width of the circumferential rib (5) is not less than 1.5 times of the diameter of the longitudinal steel bar (6).
7. The template-free assembled UHPC-recycled concrete composite column according to claim 2, 3 or 6, wherein: the steel pipe (1) edge is no less than longitudinal reinforcement (6) anchor length in the hoop rib (5) position distance is short, the tip and the hoop rib (5) welding of longitudinal reinforcement (6), the surface and the interior steel pipe internal surface welding of longitudinal reinforcement (6).
8. The template-free assembled UHPC-recycled concrete composite column according to claim 2, 3 or 6, wherein: the upper surface of the stirrup (7) is welded with the edge of the short inner steel pipe (1).
9. The template-free assembled UHPC-recycled concrete composite column according to claim 2, 3 or 6, wherein: 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.
10. The template-free assembled UHPC-recycled concrete composite column according to claim 2, 3 or 6, wherein: 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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