CN113309292A - Variable-section multi-steel-pipe high-strength waste concrete combined column and construction method thereof - Google Patents
Variable-section multi-steel-pipe high-strength waste concrete combined column and construction method thereof Download PDFInfo
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- CN113309292A CN113309292A CN202110634394.6A CN202110634394A CN113309292A CN 113309292 A CN113309292 A CN 113309292A CN 202110634394 A CN202110634394 A CN 202110634394A CN 113309292 A CN113309292 A CN 113309292A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/32—Columns; Pillars; Struts of metal
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention provides a variable-section multi-steel-pipe high-strength waste concrete combined column and a construction method thereof, which are used for designing the section of a bottom-layer column and the variable section respectively. Realize multiple restraint to the concrete through setting up multilayer steel pipe and multilayer steel reinforcement cage to including setting up a plurality of chambeies boards between outer steel pipe, increase the cooperative work ability of each steel pipe when cutting apart inner space, set up the steel construction in order to deal with unfavorable operating mode in stress concentration department, the restraint effect to the concrete has effectively been strengthened in above cross-sectional design, the bulky concrete shrinkage has been alleviated, the heat of hydration problem, the redundancy of component has been increased, each partial joint degree and wholeness have been strengthened. And removing the outermost steel pipe and the corresponding cavity concrete during variable cross section, arranging a steel cover plate and an extension part cavity dividing plate, and continuously extending the cavity dividing plate and the inner steel pipe to ensure reliable transition of the upper column and the lower column. High-strength recycled concrete, nickel slag concrete or steel slag concrete are adopted in the steel pipe to promote engineering application of high-strength solid waste concrete.
Description
Technical Field
The invention relates to a variable-section multi-steel-pipe high-strength waste concrete combined column and a construction method thereof, belonging to the technical field of steel-concrete combined structures.
Background
The vertical stressed member of high-rise or super high-rise building is usually variable in cross section, the cross section of the bottom column is usually larger to bear the huge load transmitted from the upper building, the mechanical requirement is gradually reduced along with the increase of the height, and the cross section is also reduced. Therefore, two aspects of design need to be made, namely, the bottom layer column needs enough redundancy to deal with the occurrence of the most unfavorable working condition, and the variable cross section needs to ensure the smooth transmission of load and the reliable connection of the upper column and the lower column. The steel tube concrete column applied to a high-rise or super high-rise building has larger section size, the long-term shrinkage of the internal concrete can generate adverse effects on the restraint effect and the common working performance of the steel tube, and the conventional combined structure design standard (JGJ138-2016) clearly specifies that the round steel tube concrete column with the diameter of more than 2 meters needs to take effective measures to reduce the influence of the shrinkage of the concrete in the steel tube on the stress performance. Under the constraint action of the outer steel tube, the core area concrete can adopt high-strength concrete, and further, part of solid waste is doped into the high-strength concrete, so that the influence on the mechanical property of the high-strength concrete is small, but the method has exemplary significance on the application and popularization of the high-strength solid waste concrete.
Disclosure of Invention
In order to solve the technical problems that the section size of a steel tube concrete column applied to a high-rise or super high-rise building is larger and the long-term shrinkage of internal concrete has adverse effects on the restraint effect and the common working performance of a steel tube, the invention provides a variable-section multiple steel tube-high-strength waste concrete combined column, aiming at increasing the restraint effect of a steel tube concrete bottom column, reducing the shrinkage of mass concrete and realizing smooth transition of a variable section, realizing multiple restraint on concrete by arranging multiple layers of steel tubes and multiple layers of steel reinforcement cages and solving the problem of insufficient restraint due to overlarge section size; a plurality of cavity dividing plates are arranged between the inner steel pipe and the outer steel pipe to divide the inner space into a plurality of cavities, so that the negative effects of the large-volume concrete caused by shrinkage and hydration heat are relieved; connecting laths or vertical rib plates with larger thickness and higher strength are arranged at the joint of the cavity dividing plate and the steel pipe so as to respond to the complex stress transmission at the joint under the action of extreme load; the cavity dividing plate and the inner steel pipe are provided with communicating holes for communicating concrete among the cavities, and the inner wall and the outer wall of the steel pipe are provided with annular stiffening ribs for enhancing the connection degree of an interface; and removing the outermost steel pipe and the corresponding cavity concrete at the variable cross section, and arranging a steel cover plate and a part of extended cavity dividing plate to realize reliable transition of the upper column and the lower column.
The invention provides a construction method of a variable-section multi-steel-pipe and high-strength waste concrete combined column, which specifically comprises the following steps:
(1) prefabrication work: firstly, communicating holes are formed in a middle steel pipe, an inner steel pipe and a cavity dividing plate, a plurality of connecting laths, vertical rib plates and annular rib plates are welded at corresponding positions of the inner steel pipe, the connecting positions keep the integrity of the connecting laths and the vertical rib plates, and the annular rib plates are disconnected; the welding work of the connecting laths, the vertical rib plates and the annular rib plates on the outer steel pipe and the middle steel pipe is finished in the same sequence; finishing the binding manufacture of the outer reinforcement cage and the inner reinforcement cage, and binding the outer reinforcement cage and the inner reinforcement cage together through positioning reinforcements, wherein the work is prefabricated in a factory;
(2) and (3) field construction: firstly, positioning an inner steel pipe on a construction site, then sequentially positioning a middle steel pipe and an outer steel pipe, welding corresponding cavity dividing plates on connecting laths to enable the steel pipes to form a whole, placing an outer reinforcement cage and an inner reinforcement cage into the inner steel pipe, and finally pouring concrete in each cavity;
(3) and during the first variable cross section, removing the outer steel pipe and the corresponding cavity concrete, transversely arranging a steel cover plate between the top surface of the outer steel pipe and the middle steel pipe, continuously welding a section of connecting lath on the outer side of the middle steel pipe above the steel cover plate to enable the connecting plate to be welded with the connecting lath, and finally finishing pouring of the cavity concrete at the variable cross section through the pouring hole of the steel cover plate.
(4) And (4) removing the middle steel pipe and the corresponding cavity concrete at the second variable cross section, wherein the rest construction steps are consistent with the step (3).
The invention provides a variable cross-section multi-steel-tube-high-strength waste concrete combined column, which comprises an outer steel tube, a middle steel tube, an inner steel tube, cavity dividing plates, connecting laths, vertical ribbed plates, annular ribbed plates, an outer reinforced cage, an inner reinforced cage, concrete, steel cover plates and connecting plates, wherein the outer steel tube, the middle steel tube and the inner steel tube are sequentially nested in a concentric circle form from outside to inside, a plurality of cavity dividing plates are vertically arranged among the outer steel tube, the middle steel tube and the inner steel tube and are welded with adjacent steel tubes through the connecting laths, a plurality of vertical ribbed plates are vertically welded on the inner wall of the inner steel tube, a plurality of annular ribbed plates are horizontally welded on the inner wall of the outer steel tube, the middle steel tube and the inner wall of the inner steel tube, reinforced concrete formed by the outer reinforced cage, the inner reinforced cage and the concrete is arranged in the inner steel tube, the outer steel tube and the concrete in a corresponding cavity are removed at the first variable cross section, the middle steel tube and the concrete in the corresponding cavity are removed at the second variable cross section, the variable cross section is horizontally provided with a steel cover plate, and a connecting lath and a connecting plate are vertically arranged.
Preferably, the strength of steel used by the outer steel pipe, the middle steel pipe, the inner steel pipe, the cavity separating plate, the connecting lath, the vertical ribbed plate, the annular ribbed plate, the steel cover plate and the connecting plate is not lower than Q345.
Preferably, the diameter of the outer steel pipe is not less than 2.5 m.
Preferably, the thickness of the cavity dividing plate is not more than half of the thickness of the larger steel pipe connected with the cavity dividing plate, and a plurality of communicating holes are formed in the cavity dividing plate.
Preferably, the width of the connecting lath is not less than 2 times of the thickness of the connected sub-cavity plate, and the thickness of the connecting lath is not less than the thickness of the connected sub-cavity plate.
Preferably, the thickness of the vertical rib plate does not exceed the thickness of the inner steel pipe, and the width of the vertical rib plate is not less than 3 times of the thickness of the vertical rib plate.
Preferably, the thickness of the circumferential rib plate is not more than that of the steel pipe connected with the circumferential rib plate, the width of the circumferential rib plate is not less than 2 times of the thickness of the circumferential rib plate, and the circumferential rib plate is arranged at the position of the variable cross section and the position of the beam column node along the height direction.
Preferably, the concrete is high-strength recycled concrete, nickel slag concrete, steel slag concrete, high-strength concrete or other high-performance concrete, and the strength grade is not lower than C60.
Preferably, the thickness of the steel cover plate is not less than that of the connected larger steel pipe, and the steel cover plate is provided with pouring holes and air holes.
The invention provides a variable cross-section multiple steel tube-high-strength waste concrete combined column and a construction method thereof, which mainly perform cross-section design and variable cross-section design of a bottom column, realize multiple restraint on concrete by arranging multiple layers of steel tubes and multiple layers of reinforcement cages, arrange a plurality of cavity dividing plates between the inner steel tube and the outer steel tube, increase the cooperative working capacity of each steel tube while dividing the inner space, arrange a steel structure at a stress concentration position to cope with unfavorable working conditions, remove the outermost steel tube and corresponding cavity concrete during variable cross-section, realize reliable transition of an upper column and a lower column, and adopt high-strength recycled concrete, nickel slag concrete or steel slag concrete in the steel tubes to promote application and development of the high-strength waste concrete. In summary, the combined member has the following advantages:
(1) effectively strengthening the constraint action on the concrete. The multi-layer steel pipes and the multi-layer steel reinforcement cages are sequentially arranged from outside to inside, so that concrete in a core area is in a multi-restraint state, cavity dividing plates are arranged among the steel pipes, so that concrete in each cavity is in a closed restraint state, and the problem of insufficient steel pipe restraint due to overlarge section size is solved;
(2) and the problems of shrinkage and hydration heat of mass concrete are solved. On one hand, the internal concrete is divided into a plurality of parts by the multi-layer steel pipes and the cavity dividing plates, on the other hand, the doped recycled aggregate firstly absorbs water and then releases the water in the hydration process of the concrete, so that the effect of slowly releasing free water is achieved, the negative effects of the mass concrete caused by shrinkage and hydration heat can be relieved, industrial solid waste is doped, and the shrinkage problem of the mass concrete can be relieved due to the micro-expansion effect of the mass concrete;
(3) the redundancy of the components is greatly increased. Under different working conditions, stress transmission at the joint of the cavity dividing plate and the steel pipe is more complex, stress concentration and relatively weak positions are easy to occur, connecting laths or vertical rib plates with larger thickness and higher strength are required to be arranged to deal with the complex stress transmission at the joint, and a plurality of annular rib plates are arranged at the variable cross-section position and the beam column joint position to deal with the concentrated transmission of shearing force at the interface;
(4) the connection degree of each part and the integrity of the member are enhanced. The steel pipes are connected into a whole through the cavity dividing plates, the inner steel pipe and the cavity dividing plates are provided with communicating holes to communicate concrete among the cavities, the integrity of the concrete is improved, and the inner wall and the outer wall of each steel pipe are provided with circumferential stiffening ribs to strengthen the connection degree of the steel pipe and the concrete interface;
(5) the smooth force transmission and reliable connection at the variable cross section are ensured. Along with the increase of the height, when the bearing capacity requirement is reduced, an outermost steel pipe and corresponding cavity concrete can be removed, a steel cover plate and an extension part cavity dividing plate are arranged, the variable cross section design is realized, and the reliable transition of the upper column and the lower column is ensured through the continuity of the inner steel pipe and the partial continuation of the cavity dividing plate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments 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 of a variable cross-section multi-steel-pipe high-strength waste concrete composite column according to the present invention;
FIG. 2 is a schematic plan view of the variable cross-section multi-steel-pipe high-strength waste concrete composite column;
FIG. 3 is another arrangement of the multi-steel pipe;
FIG. 4 shows a possible arrangement of the multiple steel pipes;
FIG. 5 is another geometry of the web;
fig. 6 shows a possible geometry of the connection plate;
wherein, 1-outer steel tube; 2-middle steel tube; 3-inner steel tube; 4-a cavity dividing plate; 5-connecting the slats; 6-vertical rib plates; 7-annular rib plates; 8-outer reinforcement cage; 9-inner reinforcement cage; 10-concrete; 11-a steel cover plate; 12-connecting plate.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: the present embodiment is explained with reference to fig. 1 to 6. The construction method of the variable cross-section multi-steel-pipe high-strength waste concrete composite column in the embodiment specifically comprises the following steps:
(1) prefabrication work: firstly, communicating holes are formed in a middle steel pipe 2, an inner steel pipe 3 and a cavity dividing plate 4, a plurality of connecting laths 5, vertical rib plates 6 and annular rib plates 7 are welded at corresponding positions of the inner steel pipe 3, the connecting parts keep the integrity of the connecting laths 5 and the vertical rib plates 6, and the annular rib plates 7 are disconnected; the welding work of the connecting laths 5, the vertical rib plates 6 and the annular rib plates 7 on the outer steel pipe 1 and the middle steel pipe 2 is finished in the same sequence; finishing the binding manufacture of the outer reinforcement cage 8 and the inner reinforcement cage 9, and binding the outer reinforcement cage and the inner reinforcement cage together through positioning reinforcements, wherein the work is prefabricated in a factory;
(2) and (3) field construction: firstly, positioning an inner steel pipe 3 on a construction site, then sequentially positioning a middle steel pipe 2 and an outer steel pipe 1, welding corresponding cavity dividing plates 4 on connecting laths 5 to form the whole steel pipes, putting an outer reinforcement cage 8 and an inner reinforcement cage 9 into the inner steel pipe 3, and finally pouring concrete 10 in each cavity;
(3) when the cross section is changed for the first time, the outer steel tube 1 and the corresponding cavity concrete are removed, the steel cover plate 11 is transversely arranged between the top surface of the outer steel tube 1 and the middle steel tube 2, a section of connecting lath 5 is continuously welded on the outer side of the middle steel tube 2 above the steel cover plate 11, the connecting plate 12 is welded with the connecting lath 5, and finally the cavity concrete at the position of the variable cross section is poured through the pouring hole of the steel cover plate 11.
(4) And (4) removing the middle steel pipe 2 and the corresponding cavity concrete at the second variable cross section, wherein the rest construction steps are consistent with the step (3).
The invention relates to a variable-section multi-steel-tube-high-strength waste concrete combined column, which comprises an outer steel tube 1, a middle steel tube 2, an inner steel tube 3, cavity dividing plates 4, connecting laths 5, vertical rib plates 6, annular rib plates 7, an outer steel reinforcement cage 8, an inner steel reinforcement cage 9, concrete 10, a steel cover plate 11 and connecting plates 12, wherein the outer steel tube 1, the middle steel tube 2 and the inner steel tube 3 are sequentially nested in a concentric circle form from outside to inside, a plurality of cavity dividing plates 4 are vertically arranged among the steel tubes of the outer steel tube 1, the middle steel tube 2 and the inner steel tube 3 and are welded with adjacent steel tubes through the connecting laths 5, the vertical rib plates 6 are vertically welded on the inner wall of the inner steel tube 3, the annular rib plates 7 are horizontally welded on the inner wall of the outer steel tube 1, the middle steel tube 2 and the inner and outer walls of the inner steel tube 3, reinforced concrete formed by the outer steel reinforcement cage 8, the inner steel reinforcement cage 9 and the concrete 10 is arranged inside the inner steel tube 3, the outer steel tube 1 and the concrete in the corresponding cavity are removed at the first variable cross section, the middle steel tube 2 and the concrete in the corresponding cavity are removed at the second variable cross section, the steel cover plate 11 is horizontally arranged at the variable cross section, and the connecting plate strip 5 and the connecting plate 12 are vertically arranged.
The strength of steel materials used by the outer steel pipe 1, the middle steel pipe 2, the inner steel pipe 3, the cavity dividing plate 4, the connecting lath 5, the vertical rib plate 6, the annular rib plate 7, the steel cover plate 11 and the connecting plate 12 is not lower than Q345.
The outer steel tube 1, the middle steel tube 2 and the inner steel tube 3 can be sequentially nested in a concentric circle form as shown in fig. 1, or the outer steel tube 1 and the inner steel tube 3 are concentric circles and the middle steel tube 2 is square as shown in fig. 3, or the outer steel tube 1, the middle steel tube 2 and the inner steel tube 3 are nested in a concentric square form as shown in fig. 4.
The shape of the connecting plate 12 may be triangular as shown in fig. 1, or may be the shape shown in fig. 5 and 6.
The thickness of the cavity dividing plate 4 is not more than half of the thickness of a larger steel pipe connected with the cavity dividing plate, and a plurality of communicating holes are formed in the cavity dividing plate 4.
The width of the connecting lath 5 is not less than 2 times of the thickness of the connected cavity plate 4, and the thickness of the connecting lath 5 is not less than the thickness of the connected cavity plate 4.
The thickness of the vertical rib plate 6 is not more than the thickness of the inner steel pipe 3, and the width of the vertical rib plate 6 is not less than 3 times of the thickness of the vertical rib plate.
The thickness of the annular rib plate 7 is not more than that of the steel pipe connected with the annular rib plate 7, the width of the annular rib plate 7 is not less than 2 times of the thickness of the annular rib plate, and the annular rib plate 7 is arranged at the position of the variable cross section and the position of the beam column node along the height direction.
The thickness of the steel cover plate 11 is not less than that of a larger steel pipe connected with the steel cover plate, and the steel cover plate 11 is provided with a pouring hole and an air hole.
The diameter-thickness ratio of the outer steel pipe 1, the middle steel pipe 2 and the inner steel pipe 3 should meet the requirements of 'design specification of composite structure' JGJ138-2016, the diameter of the outer steel pipe 1 is not less than 2.5m, and the inner steel pipe is provided with a plurality of communicating holes.
The concrete 10 is high-strength recycled concrete, nickel slag concrete, steel slag concrete, high-strength concrete or other high-performance concrete, and the strength grade is not lower than C60.
The thickness of the connecting plate 12 is the same as that of the connected sub-cavity plate 4, and the height is not less than 2 times of the length of the connected sub-cavity plate 4.
The distance between the outermost layer of the outer steel reinforcement cage 8 and the inner edge of the annular rib plate 7 is not less than 50 mm.
The diameter difference of the outer steel pipe 1, the middle steel pipe 2 and the inner steel pipe 3 is not less than 600 mm.
The construction method of the variable cross-section multiple steel tube-high-strength waste concrete combined column comprises the following steps:
firstly, communicating holes are formed in a middle steel pipe 2, an inner steel pipe 3 and a cavity dividing plate 4, a plurality of connecting laths 5, vertical rib plates 6 and annular rib plates 7 are welded at corresponding positions of the inner steel pipe 3, the connecting parts keep the integrity of the connecting laths 5 and the vertical rib plates 6, and the annular rib plates 7 are disconnected; the welding work of the connecting laths 5, the vertical rib plates 6 and the circumferential rib plates 7 on the outer steel pipe 1 and the middle steel pipe 2 is similarly completed. The binding manufacture of the outer reinforcement cage 8 and the inner reinforcement cage 9 is completed simultaneously, and the two are bound together through the positioning steel bars, so that the work can be prefabricated in a factory. In a construction site, the inner steel pipe 3 is firstly positioned, then the middle steel pipe 2 and the outer steel pipe 1 are sequentially positioned, and then corresponding cavity dividing plates 4 are welded on the connecting laths 5, so that the steel pipes form a whole. And placing the outer reinforcement cage 8 and the inner reinforcement cage 9 into the inner steel pipe 3, and finally pouring concrete 10 in each cavity.
When the cross section is changed for the first time, the outer steel tube 1 and the corresponding cavity concrete are removed, the steel cover plate 11 is transversely arranged between the top surface of the outer steel tube 1 and the middle steel tube 2, a section of connecting lath 5 is continuously welded on the outer side of the middle steel tube 2 above the steel cover plate 11, the connecting plate 12 is welded with the connecting lath 5, and finally the cavity concrete at the position of the variable cross section is poured through the pouring hole of the steel cover plate 11. The middle steel tube 2 and the corresponding cavity concrete are removed at the second variable cross section, and the construction steps are not repeated.
The invention designs a variable cross-section multiple steel tube-high-strength waste concrete combined column, which mainly performs cross-section design and variable cross-section design of a bottom column, realizes multiple constraints on concrete by arranging multiple layers of steel tubes and multiple layers of reinforcement cages, arranges a plurality of cavity dividing plates between the inner steel tube and the outer steel tube, increases the cooperative working capacity of each steel tube while dividing the inner space, arranges a steel structure at a stress concentration position to cope with unfavorable working conditions, removes the outermost steel tube and corresponding cavity concrete during cross-section variation, realizes reliable transition of an upper column and a lower column, and can adopt high-strength recycled concrete, nickel slag concrete or steel slag concrete in the steel tubes so as to play an exemplary role in application and popularization of the high-strength waste concrete.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A construction method of a variable cross-section multi-steel tube-high-strength waste concrete combined column is characterized by comprising the following steps:
(1) prefabrication work: firstly, communicating holes are formed in a middle steel pipe (2), an inner steel pipe (3) and a cavity dividing plate (4), a plurality of connecting laths (5), vertical rib plates (6) and annular rib plates (7) are welded at corresponding positions of the inner steel pipe (3), the connecting positions keep the completeness of the connecting laths (5) and the integrity of the vertical rib plates (6), and the annular rib plates (7) are disconnected; the welding work of the connecting laths (5), the vertical rib plates (6) and the annular rib plates (7) on the outer steel pipe (1) and the middle steel pipe (2) is finished in the same sequence; finishing the binding manufacture of the outer reinforcement cage (8) and the inner reinforcement cage (9), and binding the outer reinforcement cage and the inner reinforcement cage together through positioning reinforcements, wherein the work is prefabricated in a factory;
(2) and (3) field construction: firstly positioning an inner steel pipe (3) on a construction site, then sequentially positioning a middle steel pipe (2) and an outer steel pipe (1), welding corresponding cavity dividing plates (4) on connecting laths (5) to enable the steel pipes to form a whole, placing an outer reinforcement cage (8) and an inner reinforcement cage (9) into the inner steel pipe (3), and finally pouring concrete (10) in each cavity;
(3) when the cross section is changed for the first time, removing the outer steel pipe (1) and the corresponding cavity concrete, transversely arranging a steel cover plate (11) between the top surface of the outer steel pipe (1) and the middle steel pipe (2), continuously welding a section of connecting lath (5) on the outer side of the middle steel pipe (2) above the steel cover plate (11), welding the connecting plate (12) and the connecting lath (5), and finally finishing pouring the cavity concrete at the variable cross section through a pouring hole of the steel cover plate (11);
(4) and (4) removing the middle steel pipe (2) and the corresponding cavity concrete at the second variable cross section, wherein the rest construction steps are consistent with the step (3).
2. The variable cross-section multi-steel-tube-high-strength waste concrete combined column as claimed in claim 1, comprising an outer steel tube (1), a middle steel tube (2), an inner steel tube (3), cavity dividing plates (4), connecting laths (5), vertical ribs (6), circumferential ribs (7), an outer steel reinforcement cage (8), an inner steel reinforcement cage (9), concrete (10), steel cover plates (11) and connecting plates (12), wherein the outer steel tube (1), the middle steel tube (2) and the inner steel tube (3) are sequentially nested from outside to inside, a plurality of cavity dividing plates (4) are vertically arranged among the steel tubes of the outer steel tube (1), the middle steel tube (2) and the inner steel tube (3) and are welded with adjacent steel tubes through the connecting laths (5), a plurality of vertical ribs (6) are vertically welded on the inner wall of the inner steel tube (3), and a plurality of circumferential ribs (7) are welded on the inner wall of the outer steel tube (1), the middle steel tube (2) and the horizontal wall of the inner steel tube (3), the reinforced concrete that interior steel pipe (3) inside was formed for outer reinforcement cage (8), interior reinforcement cage (9) and concrete (10), removes outer steel pipe (1) and corresponding cavity in the variable cross section department for the first time, and the variable cross section department removes well steel pipe (2) and corresponding cavity in the concrete, and variable cross section department level sets up steel apron (11), vertical connection lath (5) and connecting plate (12).
3. The variable cross-section multi-steel-pipe high-strength waste concrete combined column according to claim 2, wherein the strength of steel used for the outer steel pipe (1), the middle steel pipe (2), the inner steel pipe (3), the cavity dividing plate (4), the connecting laths (5), the vertical rib plates (6), the circumferential rib plates (7), the steel cover plate (11) and the connecting plate (12) is not lower than Q345.
4. The variable cross-section multi-steel-pipe high-strength waste concrete composite column according to claim 2, wherein the outer steel pipe (1) has a diameter of not less than 2.5 m.
5. The variable cross-section multiple steel tube-high-strength waste concrete combined column as claimed in claim 2, wherein the thickness of the cavity plate (4) is not more than half of the thickness of the larger steel tube connected with the cavity plate, and a plurality of communicating holes are formed in the cavity plate (4).
6. The variable cross-section multi-steel tube-high-strength waste concrete composite column according to claim 2, wherein the width of the connecting lath (5) is not less than 2 times the thickness of the connected cavity plate (4), and the thickness of the connecting lath (5) is not less than the thickness of the connected cavity plate (4).
7. The variable cross-section multi-steel-pipe high-strength waste concrete composite column according to claim 2, wherein the thickness of the vertical rib plate (6) does not exceed the thickness of the inner steel pipe (3), and the width of the vertical rib plate (6) is not less than 3 times of the thickness of the vertical rib plate.
8. The variable cross-section multi-steel tube-high-strength waste concrete combined column according to claim 2, wherein the thickness of the circumferential rib plate (7) is not more than the thickness of the steel tube connected with the circumferential rib plate, the width of the circumferential rib plate (7) is not less than 2 times of the thickness of the circumferential rib plate, and the circumferential rib plate (7) is arranged at the variable cross-section position and the beam column node position in the height direction.
9. The variable cross-section multi-steel tube-high strength waste concrete composite column according to claim 2, wherein the concrete (10) is high strength recycled concrete, nickel slag concrete, steel slag concrete, high strength concrete or other high performance concrete, and the strength grade is not lower than C60.
10. The variable cross-section multi-steel tube-high-strength waste concrete combined column as claimed in claim 2, wherein the thickness of the steel cover plate (11) is not less than that of the larger steel tube connected with the steel cover plate, and the steel cover plate (11) is provided with pouring holes and air holes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809448A (en) * | 2022-04-19 | 2022-07-29 | 哈尔滨工业大学 | Template-free assembled UHPC-recycled concrete composite column and construction method |
| US20230139840A1 (en) * | 2021-10-29 | 2023-05-04 | Zhengzhou University | FRP Composite Spiral Stirrup Confined Concrete Column And Compression Design Method Thereof |
| WO2024169994A1 (en) * | 2023-02-14 | 2024-08-22 | 王哲 | Manufacturing method for variable cross-section column and column |
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| CN114809448A (en) * | 2022-04-19 | 2022-07-29 | 哈尔滨工业大学 | Template-free assembled UHPC-recycled concrete composite column and construction method |
| CN114809448B (en) * | 2022-04-19 | 2024-02-06 | 哈尔滨工业大学 | Template-free assembled UHPC-recycled concrete superposed column and construction method |
| WO2024169994A1 (en) * | 2023-02-14 | 2024-08-22 | 王哲 | Manufacturing method for variable cross-section column and column |
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