Fabricated concrete filled steel tubular column and splicing structure

Abstract

The utility model discloses an assembly type concrete filled steel tubular column and a splicing structure. The steel pipe concrete column comprises a steel pipe; the steel bars are uniformly distributed in the steel pipe along the axial direction parallel to the steel pipe; the reinforcing steel bar connecting parts are uniformly distributed in the steel pipe in the axial direction parallel to the steel pipe and correspond to the reinforcing steel bars one to one; the concrete is poured in the preset area of the steel pipe, an upper reserved area is formed between the top of the concrete and the top of the steel pipe, and a lower reserved area is formed between the bottom of the concrete and the bottom of the steel pipe; a grout inlet hole is formed in the upper reserved area, and a grout outlet hole is formed in the lower reserved area; wherein the bottom of each reinforcing steel bar connecting part is pre-buried in the concrete and is connected with the top of each reinforcing steel bar; the top of each steel bar connecting part is used for being connected with the bottom of a steel bar of another steel pipe concrete column. According to the concrete filled steel tubular column, the large-aperture metal corrugated pipe is adopted as the steel bar connecting part, a specially-processed steel bar sleeve is not needed, the construction process is simple, and the construction convenience is improved.

Description

Technical Field

[0001] The utility model relates to the field of construction equipment, in particular to a prefabricated concrete-filled steel tubular column and a splicing structure thereof. Background Art

[0002] Developing prefabricated concrete-filled steel tubular columns is an important part of developing prefabricated buildings. Due to their high flexural stiffness and bearing capacity, concrete-filled steel tubular columns have developed rapidly in engineering structures in recent years.

[0003] The connection of concrete-filled steel tubular structure columns is similar to that of steel structure columns. Bolt-flange connection, sleeve connection, and grouting connection with steel bar anchors are the main forms of connection nodes for prefabricated steel structure columns. The bolt-flange connection has a large amount of steel used at the connection node and the flange plate protrudes from the original column section, which is not beautiful. The axial force transmission mechanism of the reinforced sleeve grouting connection is reasonable and the force transmission performance is reliable, but its cost is high and the construction requirements are strict. The steel bar grouting connection with anchors is simple in construction, but the eccentric force transmission mechanism is not ideal enough, affecting the ductility and deformation capacity of the joint. Summary of the Utility Model

[0004] The utility model provides a prefabricated concrete-filled steel tubular column and a splicing structure thereof to improve the convenience of construction.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] In the first aspect of the technical solution of the utility model, a prefabricated concrete-filled steel tubular column is provided, including:

[0007] A steel pipe;

[0008] Multiple steel bars are uniformly distributed in the steel pipe along the axial direction parallel to the steel pipe. The top of each steel bar is located inside the steel pipe, and the bottom of each steel bar protrudes from the bottom of the steel pipe;

[0009] Multiple steel bar connection parts are uniformly distributed in the steel pipe along the axial direction parallel to the steel pipe, corresponding to the multiple steel bars one by one. The bottom of each steel bar connection part is located inside the steel pipe, and the top of each steel bar connection part is flush with the top of the steel pipe;

[0010] Concrete is poured in a preset area of the steel pipe, so that an upper reserved area is formed between the top of the concrete and the top of the steel pipe, and a lower reserved area is formed between the bottom of the concrete and the bottom of the steel pipe; a grout inlet hole is opened at the bottom of the upper reserved area, and a grout outlet hole is opened at the top of the lower reserved area;

[0011] Among them, the bottom of each of the steel bar connection parts is pre-embedded in the concrete and is respectively connected to the top of one of the steel bars; the top of each of the steel bar connection parts is used to be connected to the bottom of a steel bar of another concrete-filled steel tubular column.

[0012] Preferably, the steel bar connection part includes:

[0013] A metal corrugated pipe, which is arranged in the steel pipe along the axial direction parallel to the steel pipe;

[0014] Spiral stirrups, which are arranged around the outside of the metal corrugated pipe;

[0015] Multiple additional steel bars, which are uniformly distributed between the outside of the metal corrugated pipe and the inside of the spiral stirrups along the axial direction parallel to the steel pipe.

[0016] Preferably, the spiral stirrups and the multiple additional steel bars are welded and fixed to form a spiral steel cage.

[0017] Preferably, the metal corrugated pipe, the spiral stirrups and the additional steel bars have the same length, and the length of the metal corrugated pipe is not less than twice the specified grout anchorage length La;

[0018] The outer diameter of the corrugated pipe is not less than 40 mm, the stirrup diameter of the spiral stirrups is not less than 6 mm, and the diameter of the additional steel bars is not less than 8 mm.

[0019] Preferably, the steel pipe is a circular steel pipe, and the multiple steel bars are jointly arranged in a circle around the central axis of the circular steel pipe;

[0020] Or, the steel pipe is a square steel pipe, and the multiple steel bars are jointly arranged in a square around the central axis of the circular steel pipe;

[0021] Preferably, at the position on the steel pipe corresponding to the upper reserved area, a plurality of the grout inlet holes are evenly opened along the circumferential direction of the steel pipe;

[0022] At the position on the steel pipe corresponding to the lower reserved area, a plurality of the grout outlet holes are evenly opened along the circumferential direction of the steel pipe.

[0023] Preferably, it further includes:

[0024] Multiple reinforcing ribs, the reinforcing ribs are arranged in the steel pipe along the direction perpendicular to the steel bars, and the multiple reinforcing ribs are arranged at intervals along the axial direction of the steel pipe.

[0025] In the second aspect of the technical solution of the present invention, a splicing structure of a prefabricated concrete-filled steel tubular column is provided, which includes at least two of the above-mentioned concrete-filled steel tubular columns;

[0026] Among them, any two adjacent concrete-filled steel tubular columns are spliced together so that multiple steel bars at the bottom of one of the concrete-filled steel tubular columns are respectively connected to multiple steel bar connection parts at the top of the other reinforced concrete column;

[0027] Moreover, the lower reserved area of the concrete-filled steel tubular column located above and the upper reserved area of the concrete-filled steel tubular column located below jointly form a post-grouting area, so that the grouting material can enter the post-grouting area from the grout inlet hole and can flow out of the post-grouting area from the grout outlet hole; the grouting material adopts a slightly expanding cement-based grouting material with a concrete strength higher than that of the concrete-filled steel tubular column and high fluidity.

[0028] Preferably, the steel pipe connection sections of two adjacent concrete-filled steel tubular columns are welded and fixed.

[0029] Preferably, it further includes:

[0030] A base, which is arranged at the bottom of the splicing structure and is fixedly connected to the concrete-filled steel tubular column at the bottommost of the splicing structure.

[0031] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0032] 1. By using large-diameter metal corrugated pipes as steel bar connection parts, the high-precision requirements of steel bar sleeve grouting connections are avoided, and there is no need for specially processed steel bar sleeves, and the construction production process is simple; at the same time, the use of metal corrugated pipes reduces the minimum anchorage length of longitudinal steel bars and improves the convenience of construction.

[0033] 2. The force transmission at the splicing joints of prefabricated concrete-filled steel tubular columns is reasonable. The spiral steel reinforcement cage plays a role in restraining the concrete around the metal corrugated pipe, strengthening the weak parts of the splicing joints of concrete-filled steel tubular columns and improving the seismic performance of the overall structure.

[0034] 3. There is no redundant structure outside the splicing joints of prefabricated concrete-filled steel tubular columns, the structure is simple, the use function of prefabricated buildings is increased, and the practicability is strong. Description of the Drawings

[0035] Figure 1 It is a schematic internal structure diagram of a prefabricated concrete-filled steel tubular column provided by the first embodiment of the present utility model;

[0036] Figure 2 It is a schematic end face structure diagram of a prefabricated concrete-filled steel tubular column;

[0037] Figure 3 It is a schematic structure diagram of a splicing structure of a prefabricated concrete-filled steel tubular column provided by the first embodiment of the present utility model.

[0038] In the drawings, each reference numeral represents:

[0039] 1. Steel pipe; 2. Steel bar; 3. Steel bar connection part; 31. Metal corrugated pipe; 32. Spiral stirrup; 33. Additional steel bar; 4. Concrete; 5. Reinforcing rib; 110. Upper reserved area; 120. Lower reserved area; 101. Grout inlet hole; 102. Grout outlet hole; 130. Post-grouting area. Specific embodiments

[0040] To make the objectives, features, and advantages of the present utility model more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

[0041] The embodiments of the present utility model provide a prefabricated concrete-filled steel tubular column and splicing structure. By embedding steel bars and steel bar connection parts in the steel pipe, after pouring grouting material, the grout-anchoring fixation of two concrete-filled steel tubular columns can be directly realized through the cooperation of the steel bar connection part and the steel bar. Thus, with a simple structure, the problem of complex assembly construction of prefabricated concrete-filled steel tubular columns is solved, and at the same time, the strength of the connection area of the prefabricated concrete-filled steel tubular column is enhanced, thereby increasing the seismic performance of the overall prefabricated building.

[0042] First embodiment:

[0043] As Figure 1 and Figure 2 shown, a prefabricated concrete-filled steel tubular column provided by the first embodiment of the present utility model includes a steel pipe 1, multiple steel bars 2, multiple steel bar connection parts 3, and concrete 4. Among them, multiple steel bars 2 and multiple steel bar connection parts 3 are both embedded in the steel pipe 1 through concrete 4, and the top of the steel bar 2 is connected to the steel bar connection part 3. When two concrete-filled steel tubular columns are spliced, the steel bar 2 of another steel pipe is connected to the steel bar connection part 3, thereby realizing the grout-anchoring fixation of two concrete-filled steel tubular columns.

[0044] Specifically, in this embodiment, the steel pipe 1 is a circular steel pipe, but it is not limited to this structural form. In other embodiments, a square steel pipe or other shaped steel pipes can also be used. And the specific dimensions of the steel pipe 1 can be adaptively selected according to needs, and no specific limitation is made here.

[0045] As Figure 1 shown, in this embodiment, multiple steel bars 2 are uniformly distributed in the steel pipe 1 along the axial direction parallel to the steel pipe 1 (i.e., Figure 1 the vertical direction inFigure 2 As shown in the figure, in this embodiment, since the steel pipe 1 is a circular steel pipe, a plurality of steel bars 2 are arranged around the central axis of the circular steel pipe 1 to form a circle, so as to match the shape of the steel pipe 1, thereby ensuring the uniformity of force. It can be understood that arranging a plurality of steel bars 2 into a circular shape matching the circular steel pipe 1 is only a preferred implementation manner. In other embodiments, it can also be arranged into a square or triangular shape, etc. And with the change of the shape of the steel pipe 1, the layout positions of the plurality of steel bars 2 can be adjusted adaptively.

[0046] As Figure 1 shown in the figure, in this embodiment, a plurality of steel bar connection parts 3 are evenly distributed in the steel pipe 1 along the axial direction parallel to the steel pipe 1 and correspond to the plurality of steel bars 2 one by one. And the bottom of each steel bar connection part 3 is located inside the steel pipe 1, and the top of each steel bar connection part 3 is flush with the top of the steel pipe 1. Specifically, referring to Figure 2 shown in the figure, the steel bar connection part 3 includes a metal corrugated pipe 31, a spiral stirrup 32 and a plurality of additional steel bars 33. Among them, the metal corrugated pipe 31 is in a circular tube shape, and the metal corrugated pipe 31 is arranged in the steel pipe 1 along the axial direction parallel to the steel pipe 1. Correspondingly, the spiral stirrup 32 is arranged outside the metal corrugated pipe 31, and a plurality of additional steel bars 33 (4 in this embodiment, but not limited to the specific number of the additional steel bars 33) are evenly distributed between the outside of the metal corrugated pipe 31 and the inside of the spiral stirrup 32 along the axial direction parallel to the steel pipe 1.

[0047] In the above embodiment, preferably, the lengths of the metal corrugated pipe 31, the spiral stirrup 32 and the additional steel bars 33 are equal, and the length of the metal corrugated pipe 31 is not less than twice the standard grout anchorage length La. And considering the requirements of hole forming and construction technology of the corrugated pipe, a φ40 specification is preferably selected: the diameter of the spiral stirrup 7 is preferably 6mm, and the diameter of the additional steel bar is preferably 8mm. Thus, when two concrete-filled steel tubular columns are spliced, the lengths of the steel bars 2 of the two concrete-filled steel tubular columns extending into the metal corrugated pipe 31 can both meet the requirements of the standard grout anchorage length La, thereby ensuring the stability of the connection.

[0048] In addition, in a preferred embodiment, the spiral stirrup 32 and the plurality of additional steel bars 33 are welded and fixed to form a spiral steel cage. Thus, by pre-welding the spiral stirrup 32 and the plurality of additional steel bars 33 in the factory, placing the formed spiral steel cage outside the metal corrugated pipe 31, and then pouring grouting material to form a firm connection, it can effectively restrain the concrete around the metal corrugated pipe 31, enhance the overall continuous characteristics, and significantly improve the anti-destruction ability of the component.

[0049] As Figure 1As shown, in this embodiment, concrete 4 is poured into the preset area of steel pipe 1, so that an upper reserved area 110 is formed between the top of concrete 4 and the top of steel pipe 1, and a lower reserved area 120 is formed between the bottom of concrete 4 and the bottom of steel pipe 1. Moreover, a grout inlet hole 101 is provided at the bottom of the upper reserved area 110 for pouring grout, and a grout outlet hole 102 is provided at the top of the lower reserved area 120 for indicating whether the grout is filled up.

[0050] Moreover, in the above embodiment, preferably, at the position on the steel pipe 1 corresponding to the upper reserved area 110, a plurality of grout inlet holes 101 are evenly arranged around the circumferential direction of the steel pipe 1. Similarly, at the position on the steel pipe 1 corresponding to the lower reserved area 120, a plurality of grout outlet holes 102 are evenly arranged around the circumferential direction of the steel pipe 1. Thus, by providing a plurality of grout inlet holes 101, the grouting efficiency can be improved, and by providing a plurality of grout outlet holes 102, the grouting position can be indicated from multiple positions, avoiding the situation of partial non-filling.

[0051] In addition, as Figure 1 shown, in the above embodiment, preferably, the concrete-filled steel tube column further includes a plurality of reinforcing bars 5, the reinforcing bars 5 are arranged in the steel pipe 1 along the direction perpendicular to the steel bars 2, and the plurality of reinforcing bars 5 are spaced along the axial direction of the steel pipe 1. Thus, by providing a plurality of reinforcing bars 5, the overall structural strength can be further improved, and the safety in use can be improved.

[0052] Second Embodiment:

[0053] As Figure 3 shown, on the basis of the above first embodiment, the second embodiment of the present utility model further provides a splicing structure of a prefabricated concrete-filled steel tube column, including at least two of the above concrete-filled steel tube columns.

[0054] Specifically, in this embodiment, any two adjacent concrete-filled steel tube columns are spliced together, so that a plurality of steel bars 2 at the bottom of one concrete-filled steel tube column are respectively connected to a plurality of steel bar connection parts 3 at the top of the other reinforced concrete column. Moreover, the lower reserved area 110 of the concrete-filled steel tube column located above and the upper reserved area 120 of the concrete-filled steel tube column located below jointly form a post-grouting area 130, so that the grout can enter the post-grouting area 130 from the grout inlet hole 101 and can flow out of the post-grouting area 130 from the grout outlet hole 102. In this embodiment, the grout adopts a micro-expansion type cement-based grout with a concrete strength higher than that of the concrete-filled steel tube column and high fluidity.

[0055] In addition, the steel pipe connection sections of two adjacent concrete-filled steel tubular columns are welded and fixed. And, preferably, the splicing structure further includes a base (not shown in the figure), which is arranged at the bottom of the splicing structure and is connected and fixed to the lowermost concrete-filled steel tubular column of the splicing structure. It can be understood that the base can be a grouting part embedded in the building support position or a separate base, and can be adaptively selected according to specific needs to meet different construction requirements.

[0056] Taking the splicing of two concrete-filled steel tubular columns as an example, the construction process of the prefabricated concrete-filled steel tubular column of this embodiment will be described in detail as follows:

[0057] First, the bottom of one concrete-filled steel tubular column is spliced on the top of another concrete-filled steel tubular column, so that the steel bars 2 of the upper concrete-filled steel tubular column can be inserted into the metal corrugated pipe 31 of the lower concrete-filled steel tubular column. At this time, the lower reserved area 120 of the upper concrete-filled steel tubular column and the upper reserved area 110 of the lower concrete-filled steel tubular column are aligned with each other, thus jointly forming a post-pouring area 130.

[0058] Then, grouting material is poured into the post-pouring area 130 from the grouting hole 101 until the grouting material flows out of the post-pouring area 130 from the bleeding hole 102.

[0059] Finally, after stopping for a preset time duration and waiting for the grouting material to cure to the standard strength, the connection sections of the upper and lower concrete-filled steel tubular columns are welded and fixed.

[0060] To sum up, a prefabricated concrete-filled steel tubular column and a splicing structure provided by an embodiment of the present utility model have the following beneficial effects:

[0061] 1. The use of large-diameter metal corrugated pipes avoids the high-precision requirements of steel bar sleeve grouting connections and eliminates the need for professionally processed steel bar sleeves. The construction manufacturing process is simple. At the same time, the use of corrugated pipes reduces the minimum anchorage length of longitudinal steel bars.

[0062] 2. The force transmission at the splicing joints of the prefabricated concrete-filled steel tubular columns is reasonable. The spiral steel cage restricts the concrete around the metal corrugated pipe, strengthens the weak parts of the splicing joints of the concrete-filled steel tubular columns, and improves the seismic performance of the overall structure.

[0063] 3. There is no redundant structure outside the splicing joints of the prefabricated concrete-filled steel tubular columns. The structure is simple, which increases the use functions of prefabricated buildings and has strong practicability.

[0064] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0065] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0066] As described above, the above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claimed rights.

Claims

1. An assembled steel tube concrete column, characterized in that: include: Steel pipe; A plurality of steel bars are evenly distributed in the steel pipe along an axial direction parallel to the steel pipe, the top of each steel bar is located in the steel pipe, and the bottom of each steel bar protrudes out of the bottom of the steel pipe; A plurality of steel bar connection parts are evenly distributed in the steel pipe along an axial direction parallel to the steel pipe and correspond to the plurality of steel bars one by one, and the bottom of each of the steel bar connection parts is located in the steel pipe, and the top of each of the steel bar connection parts is flush with the top of the steel pipe; Concrete is poured in a preset area of ​​the steel pipe, so that an upper reserved area is formed between the top of the concrete and the top of the steel pipe, and a lower reserved area is formed between the bottom of the concrete and the bottom of the steel pipe; a slurry inlet hole is opened at the bottom of the upper reserved area, and a slurry outlet hole is opened at the top of the lower reserved area; The bottom of each of the steel bar connection parts is embedded in the concrete and connected to the top of one of the steel bars respectively; the top of each of the steel bar connection parts is used to connect to the bottom of one of the steel bars of another steel tube concrete column.

2. The assembled steel tube concrete column according to claim 1, characterized in that: The steel bar connection portion comprises: A metal bellows is arranged inside the steel pipe along an axial direction parallel to the steel pipe; Spiral stirrups, arranged around the outside of the metal bellows; A plurality of additional steel bars are evenly distributed between the outer side of the metal corrugated tube and the inner side of the spiral stirrups along an axial direction parallel to the steel tube.

3. The assembled steel tube concrete column according to claim 2, characterized in that: The spiral stirrups are welded and fixed to the plurality of additional steel bars to form a spiral steel bar cage.

4. The assembled steel tube concrete column according to claim 2, characterized in that: The lengths of the metal corrugated pipe, the spiral stirrups and the additional steel bars are all equal, and the length of the metal corrugated pipe is not less than twice the standard slurry anchorage length La; The outer diameter of the corrugated pipe is not less than 40 mm, the diameter of the spiral stirrups is not less than 6 mm, and the diameter of the additional steel bars is not less than 8 mm.

5. The assembled steel tube concrete column according to claim 1, characterized in that: The steel pipe is a circular steel pipe, and the plurality of steel bars are arranged together to form a circle around the central axis of the circular steel pipe; Alternatively, the steel pipe is a square steel pipe, and the plurality of steel bars are arranged together to form a square around the central axis of the circular steel pipe.

6. The assembled steel tube concrete column according to claim 1, characterized in that: A plurality of slurry inlet holes are evenly provided at positions on the steel pipe corresponding to the upper reserved area and around the circumferential direction of the steel pipe; A plurality of slurry outlet holes are evenly provided on the steel pipe at positions corresponding to the lower reserved area and around the circumferential direction of the steel pipe.

7. The assembled steel tube concrete column according to claim 1, characterized in that: Also includes: A plurality of reinforcing ribs are arranged in the steel pipe along a direction perpendicular to the steel bars, and the plurality of reinforcing ribs are arranged at intervals along the axial direction of the steel pipe.

8. A splicing structure of assembled steel tube concrete columns, characterized in that: Comprising at least two steel tube concrete columns as described in any one of claims 1 to 7; Any two adjacent steel tube concrete columns are spliced ​​together so that a plurality of steel bars at the bottom of one of the steel tube concrete columns are respectively connected to a plurality of steel bar connection parts at the top of the other steel tube concrete column; In addition, the lower reserved area of ​​the steel tube concrete column located above and the upper reserved area of ​​the steel tube concrete column located below jointly form a post-grouting area, so that the grouting material can enter the post-grouting area from the grouting hole and can flow out of the post-grouting area from the grouting hole; the grouting material adopts a micro-expansive cement-based grouting material with higher concrete strength and fluidity than the steel tube concrete column.

9. The splicing structure according to claim 8, characterized in that: The steel tube connecting sections of two adjacent steel tube concrete columns are welded and fixed.

10. The splicing structure according to claim 8, characterized in that: Also includes: The base is arranged at the bottom of the splicing structure and is connected and fixed to the steel tube concrete column at the bottom of the splicing structure.

Images