Fabricated concrete filled steel tubular column-reinforced concrete column uniform-section connecting joint

Abstract

The utility model relates to a fabricated concrete-filled steel tubular column-reinforced concrete column uniform-section connection node, the lower end of a concrete-filled steel tubular column is fixedly connected with a threaded sleeve, the outer wall of the top end of a reinforced concrete column is provided with an external thread, and the threaded sleeve is in threaded connection with the external thread; mounting rings are correspondingly arranged on the outer walls of the reinforced concrete column and the concrete filled steel tubular column respectively, and the two mounting rings are fixed through a long bolt. The concrete filled steel tubular column has the beneficial effects that the concrete filled steel tubular column is fastened on the outer wall of the external thread outside the reinforced concrete column through the threaded sleeve at the bottom, so that the reinforced concrete column and the concrete filled steel tubular column are preliminarily fixed, and the first mounting ring is in contact with the second mounting ring; the long bolt penetrates through the first mounting ring and the second mounting ring to fix the reinforced concrete column and the steel pipe concrete column and transmit internal force between the upper layer and the lower layer, and the fastening piece is arranged to further guarantee the fixing strength of the long bolt and the nut.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete-filled steel tubular columns, in particular to an assembled concrete-filled steel tubular column - reinforced concrete column equal-section connection node. Background Art

[0002] Concrete-filled steel tube refers to a member formed by filling concrete in a steel tube. Due to a series of advantages such as high bearing capacity, corrosion resistance, and convenient construction of concrete-filled steel tube, its application in actual projects is increasing.

[0003] In actual engineering projects of high-rise and super-high-rise large public infrastructures such as airport terminals, large stadiums, and bridges, the upper space structure roof has a large span and a relatively high storey height, the supporting columns have a large slenderness ratio, and the internal forces are large under the action of loads. While the lower frame structure has a relatively low storey height and is connected to the foundation, with high durability requirements. Therefore, in actual projects, concrete-filled steel tubular columns are mostly used in the upper part and reinforced concrete columns are used in the lower part as the load-bearing structure form of such buildings. The two types of columns are converted through a conversion node, and internal forces such as compression, bending, and shear between the upper and lower layers are transmitted.

[0004] At present, the commonly used CFST-RC column conversion nodes in engineering can be divided into forms such as embedded type, end-bearing type, and jacket type. Although they can meet requirements such as strength and stability, they often have problems such as complex structure, difficult construction, and low material utilization rate. At the same time, under the same load, the cross-sectional area of the reinforced concrete column is larger than that of the concrete-filled steel tubular column, resulting in inconsistent cross-sectional areas of the upper and lower columns. In existing projects, the upper concrete-filled steel tube is often inserted one layer into the lower reinforced concrete column, but this method is relatively conservative, causing serious material waste, and having disadvantages such as uneven cross-section at the node position and less beautiful form.

[0005] In the prior art, CN206408758U provides a connection node structure for circular concrete-filled steel tubular columns. The upper circular concrete-filled steel tubular column with shear keys at the lower part is connected to the lower circular concrete-filled steel tubular column through an integral steel tube sleeve. Self-compacting concrete is poured between the integral steel tube sleeve and the upper concrete-filled steel tubular column. Among them, the integral steel tube sleeve is connected to the lower steel tube sleeve through threads, having the advantages of enhancing node connection and simplifying the node structure of the column, and reducing the occupied area of the connection node; however, the connection nodes of the concrete-filled steel tubular columns in the prior art generally rely only on the thread structure for fixation. This structure has a single fixation method, which causes the stress to be too concentrated on the thread structure to a certain extent, and thus leads to a certain reduction in seismic performance.

[0006] Therefore, there is an urgent need to design an equal-section transfer joint with equal cross-sections of the upper and lower columns, which also has the characteristics of simple connection structure, convenient assembly, high seismic performance, etc. On the premise of meeting the safety requirements such as strength, stiffness, and stability and the normal use requirements, it can increase the utilization rate of building space and reduce the consumption of building materials, and has high engineering application significance. Summary of the Invention

[0007] The purpose of the present utility model is to overcome the deficiencies in the prior art and provide an equal-section connection joint for assembled concrete-filled steel tubular column - reinforced concrete column.

[0008] For such an equal-section connection joint for assembled concrete-filled steel tubular column - reinforced concrete column, a threaded sleeve is fixedly connected to the lower end of the concrete-filled steel tubular column, and an external thread is provided on the outer wall of the top end of the reinforced concrete column. The threaded sleeve and the external thread are connected by threads; mounting rings are respectively provided on the outer walls of the reinforced concrete column and the concrete-filled steel tubular column, and the two mounting rings are fixed by long bolts;

[0009] Several steel pipe shells are fixedly connected to the inside of the bottom end of the concrete-filled steel tubular column. A steel bar is vertically inserted through each steel pipe shell, and both ends of the steel bar are respectively cast in the reinforced concrete column and the concrete-filled steel tubular column.

[0010] Preferably, a first mounting ring is fixedly connected to the outer wall below the external thread of the reinforced concrete column, and a second mounting ring is fixedly connected to the bottom end of the threaded sleeve; several bolt holes are respectively provided in the circumferential direction of both the first mounting ring and the second mounting ring. After the threaded sleeve and the external thread are connected by threads, the second mounting ring is located above the first mounting ring and the bolt holes on the two mounting rings are aligned, and the long bolts are inserted into the bolt holes for fixation.

[0011] Preferably, the long bolt screw penetrates through the two mounting rings upwards in sequence and is fixed by a nut above the mounting rings; a hole is horizontally provided on the long bolt screw, and the distance from the bottom of the hole to the top surface of the long bolt nut is greater than or equal to the sum of the thicknesses of the two mounting rings and the nut. A fastener is horizontally inserted into the hole, and the length of the fastener is greater than or equal to the inner diameter of the nut.

[0012] Preferably, a reinforcing plate is also fixed inside the reinforced concrete column. The reinforcing plate is in a cylindrical shape, and the outer wall of the reinforcing plate is fixedly connected to the inner wall of the reinforced concrete column through several plate members, and the steel bar is arranged inside the reinforcing plate.

[0013] Preferably, the steel pipe shell is a vertically arranged hollow rod-shaped structure, the inner diameter of the steel pipe shell is greater than or equal to the diameter of the steel bar, and the inner wall of the steel pipe of the concrete-filled steel tubular column is fixedly connected to the steel pipe shell through a connecting plate.

[0014] The beneficial effects of the present utility model are:

[0015] 1) In this utility model, the concrete-filled steel tubular column is fastened to the outer wall of the external thread on the outside of the reinforced concrete column by means of a threaded sleeve at the bottom, realizing the preliminary fixation of the reinforced concrete column and the concrete-filled steel tubular column, and making the first mounting ring contact the second mounting ring. The long bolt passes through the first mounting ring and the second mounting ring and then is connected to the nut, thereby realizing the secondary fixation of the reinforced concrete column and the concrete-filled steel tubular column, achieving a smooth transition of the upper and lower columns, transmitting the internal force between the upper and lower layers, and setting fasteners to further ensure the fixing strength of the long bolt and the nut.

[0016] 3) In this utility model, by inserting the steel bars through the steel pipe shell inside the concrete-filled steel tubular column, the steel bars can penetrate through the connection part between the reinforced concrete column and the concrete-filled steel tubular column. At this time, when pouring concrete, the concrete can be tamped between the reinforced concrete column and the concrete-filled steel tubular column. Furthermore, relying on the penetration setting of the steel bars, it can improve the force transfer and distribution, reduce stress concentration, enhance the seismic performance, etc., and realize rapid and adjustable construction assembly.

[0017] 3) This utility model greatly optimizes the traditional form of inserting the upper concrete-filled steel tubular column downward. While meeting the performance requirements, it realizes a reasonable transition between the upper concrete-filled steel tubular column and the lower reinforced concrete column, and the cross-sections of the upper and lower columns are consistent, so that the cross-section at the joint position is flat and the form is beautiful, and it can improve the space utilization rate and save building materials. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the main structure of this utility model;

[0019] Figure 2 It is a schematic diagram of the structure with steel bars arranged inside the reinforced concrete column of this utility model;

[0020] Figure 3 It is a schematic diagram of the structure with a steel pipe shell arranged inside the concrete-filled steel tubular column of this utility model;

[0021] Figure 4 It is a schematic diagram of the structure with a threaded sleeve arranged at the bottom of the concrete-filled steel tubular column of this utility model.

[0022] Description of the reference numerals: Reinforced concrete column 1, connection assembly 2, first mounting ring 201, bolt hole 202, second mounting ring 203, long bolt 204, nut 205, fastener 206, external thread 207, threaded sleeve 208, concrete-filled steel tubular column 3, reinforcement assembly 4, reinforcement plate 401, steel bar 402, connecting plate 403, steel pipe shell 404. Detailed Implementation Modes

[0023] The present utility model will be further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

[0024] As an embodiment, such an assembled concrete-filled steel tubular column - reinforced concrete column equal-section connection joint, as Figures 1 to 4 shown, includes a reinforced concrete column 1, a concrete-filled steel tubular column 3 is arranged at the top of the reinforced concrete column 1, and a connection assembly 2 is arranged between the reinforced concrete column 1 and the concrete-filled steel tubular column 3; the reinforced concrete column 1 and the concrete-filled steel tubular column 3 have the same cross-section.

[0025] The connection assembly 2 includes a structure for threaded connection and an installation ring. Specifically:

[0026] External threads 207 are provided on the outer wall of the reinforced concrete column 1; a threaded sleeve 208 is fixedly connected to the bottom of the concrete-filled steel tubular column 3, and the inner diameter shape and size of the threaded sleeve 208 are mutually matched with the outer diameter shape and size of the external threads 207 on the outer wall of the reinforced concrete column 1. The concrete-filled steel tubular column 3 forms a threaded structure with the reinforced concrete column 1 through the threaded sleeve 208, and the concrete-filled steel tubular column 3 is fastened to the outer wall of the reinforced concrete column 1 by relying on the threaded sleeve 208.

[0027] After the position of the reinforced concrete column 1 is fixed, by lowering the concrete-filled steel tubular column 3, the concrete-filled steel tubular column 3 can be fastened to the outer wall of the external threads 207 on the reinforced concrete column 1 by relying on the threaded sleeve 208 at the bottom, and the concrete-filled steel tubular column 3 is placed on the top of the reinforced concrete column 1. At this time, the threaded sleeve 208 at the bottom of the concrete-filled steel tubular column 3 is stuck on the outer wall of the reinforced concrete column 1. At this time, by rotating the concrete-filled steel tubular column 3, the concrete-filled steel tubular column 3 can be screwed down and fastened to the outer wall of the external threads 207 outside the reinforced concrete column 1 by relying on the threaded sleeve 208 at the bottom, realizing the preliminary fixation of the reinforced concrete column 1 and the concrete-filled steel tubular column 3.

[0028] The installation ring includes a first installation ring 201 and a second installation ring 203; the first installation ring 201 is fixed on the outer wall of the reinforced concrete column 1 below the external threads 207, and the second installation ring 203 is fixed at the bottom end of the threaded sleeve 208; after the threaded sleeve 208 and the external threads 207 are installed together through the threaded structure, the top surface of the first installation ring 201 is in contact with the bottom surface of the second installation ring 203 and is fixedly connected by a long bolt 204.

[0029] Specifically: In this embodiment, four bolt holes 202 are circumferentially provided in both the first mounting ring 201 and the second mounting ring 203; the number of long bolts 204 is four, which are used to install and fix the first mounting ring 201 and the second mounting ring 203 together;

[0030] During installation, the screw rod of the long bolt 204 faces upward, and penetrates through the first mounting ring 201 and the second mounting ring 203 in sequence from bottom to top, and then a nut 205 is connected to the outer wall thread of the long bolt 204; the second mounting ring 203 forms a fixed structure with the first mounting ring 201 through the long bolt 204, strengthening the fixing effect between the reinforced concrete column 1 and the concrete-filled steel tube column 3.

[0031] Embodiment Two

[0032] As another embodiment, this Embodiment Two is proposed based on Embodiment One, and a more specific equal-section connection node of prefabricated concrete-filled steel tube column - reinforced concrete column, wherein:

[0033] As Figure 3 and Figure 4 shown, a hole is horizontally provided on the screw rod of the long bolt 204, and the distance from the bottom of the hole to the top surface of the nut of the long bolt 204 is greater than or equal to the sum of the thicknesses of the two mounting rings and the nut 205, and a fastener 206 is horizontally inserted into the hole, and the length of the fastener 206 is greater than or equal to the inner diameter of the nut 205.

[0034] After the threaded sleeve 208 and the external thread 207 are installed together through the threaded structure, then the long bolt 204, the nut 205 and the fastener 206 are installed. The nut 205 is fastened to the outer wall of the long bolt 204 for stable fixation of the structure, and the fastener 206 is snap-connected to the outer wall of the long bolt 204 to prevent the nut 205 from loosening and causing the long bolt 204 to fall off.

[0035] It should be noted that the parts that are the same or similar to those in Embodiment One in this embodiment can be referred to each other and will not be described in detail in this application.

[0036] Embodiment Three

[0037] As another embodiment, this Embodiment Three is proposed based on Embodiments One and Two, and a more specific equal-section connection node of prefabricated concrete-filled steel tube column - reinforced concrete column. A reinforcement component 4 is further provided between the interiors of the reinforced concrete column 1 and the concrete-filled steel tube column 3. The reinforcement component 4 is specifically:

[0038] The reinforcement component 4 includes a reinforcement plate 401, reinforcing bars 402, a connecting plate 403, and a steel pipe shell 404. The connecting plate 403 is fixedly connected inside the concrete-filled steel tube column 3; and one side of the connecting plate 403 is fixedly connected with the steel pipe shell 404; the inner diameter of the steel pipe shell 404 is larger than the outer diameter of the reinforcing bar 402, so that the reinforcing bar 402 can extend into the steel pipe shell 404 for connection.

[0039] The reinforcement plate 401 is also fixedly installed inside the reinforced concrete column 1. The reinforcement plate 401 is cylindrical. The outer wall of the reinforcement plate 401 is fixedly connected to the inner wall of the reinforced concrete column 1 through several plate members, and the reinforcing bar 402 is arranged inside the reinforcement plate 401.

[0040] Insert the reinforcing bar 402 through the steel pipe shell 404 inside the concrete-filled steel tube column 3, so that the reinforcing bar 402 can penetrate through the reinforced concrete column 1 and the concrete-filled steel tube column 3. At this time, pour concrete, so that the concrete can be tamped between the reinforced concrete column 1 and the concrete-filled steel tube column 3. Furthermore, relying on the penetrating arrangement of the reinforcing bar 402, it can improve the force transfer and distribution, reduce stress concentration, enhance the seismic performance, etc., or achieve rapid and adjustable construction assembly. At the same time, relying on the arrangement of the reinforcement plate 401 inside the reinforced concrete column 1, the reinforcement plate 401 can further enhance the overall structural strength of the concrete-filled steel tube.

[0041] It should be noted that the same or similar parts in this embodiment and the first and second embodiments can be referred to each other and will not be elaborated in this application.

[0042] Embodiment 4

[0043] As another embodiment, this Embodiment 4 is proposed on the basis of Embodiments 1 to 3. When constructing this assembled concrete-filled steel tube column - reinforced concrete column equal-section connection joint, rapid and adjustable construction assembly can be realized:

[0044] Step 1: Bury the bottom part of the reinforced concrete column 1 underground, and place the concrete-filled steel tube column 3 on the top of the reinforced concrete column 1. At this time, the threaded sleeve 208 at the bottom of the concrete-filled steel tube column 3 is initially stuck on the outer wall of the reinforced concrete column 1.

[0045] Step 2: Rotate the concrete-filled steel tube column 3, so that the concrete-filled steel tube column 3 can be fastened to the outer wall of the external thread 207 on the outside of the reinforced concrete column 1 by relying on the threaded sleeve 208 at the bottom, and then the preliminary fixation of the reinforced concrete column 1 and the concrete-filled steel tube column 3 can be realized. After installation at this time, the first installation ring 201 is in contact with the second installation ring 203.

[0046] Step 3: Depend on the long bolt 204 to penetrate through the first mounting ring 201 and the second mounting ring 203 and then connect with the nut 205, and insert the fastener 206 to block the nut 205 again, thereby fixing the reinforced concrete column 1 and the concrete-filled steel tubular column 3 for the second time. In addition, through the conversion and connection by the conversion joint between the reinforced concrete column 1 and the concrete-filled steel tubular column 3, the smooth transition of the upper and lower columns can be realized, and the internal force between the upper and lower layers can be transmitted.

[0047] Step 4: Insert the steel bars 402 into the steel pipe shell 404 inside the concrete-filled steel tubular column 3 in sequence, so that both ends of the steel bars 402 are respectively inside the reinforced concrete column 1 and the concrete-filled steel tubular column 3.

[0048] Step 5: Pour the concrete to make the concrete compact between the reinforced concrete column 1 and the concrete-filled steel tubular column 3. Then, depending on the penetrating arrangement of the steel bars 402, effects such as improving the force transmission and distribution, reducing stress concentration, and enhancing the seismic performance can be achieved.

[0049] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same and similar parts among the embodiments, reference can be made to each other.

Claims

1. An assembled concrete-filled steel tubular column - reinforced concrete column equal-section connection joint, characterized in that, The lower end of the concrete-filled steel tube column is fixedly connected with a threaded sleeve, and an external thread is provided on the outer wall of the top end of the reinforced concrete column. The threaded sleeve and the external thread are connected by threads; mounting rings are respectively provided on the outer walls of the reinforced concrete column and the concrete-filled steel tube column, and the two mounting rings are fixed by long bolts. Several steel pipe shells are fixedly connected inside the bottom end of the concrete-filled steel tube column. A steel bar is vertically inserted through each steel pipe shell, and both ends of the steel bar are poured into the reinforced concrete column and the concrete-filled steel tube column respectively.

2. The prefabricated concrete-filled steel tubular column-reinforced concrete column equal-section connection joint according to claim 1, wherein A first mounting ring is fixedly connected to the outer wall below the external thread of the reinforced concrete column, and a second mounting ring is fixedly connected to the bottom end of the threaded sleeve; several bolt holes are circumferentially provided on both the first mounting ring and the second mounting ring. After the threaded sleeve and the external thread are connected by threads, the second mounting ring is located above the first mounting ring and the bolt holes on the two mounting rings are aligned, and the long bolts are inserted into the bolt holes for fixation.

3. The assembled concrete-filled steel tubular column - reinforced concrete column equal-section connection joint according to claim 1, wherein The long bolt screw penetrates through the two mounting rings upwards in sequence and is fixed by a nut above the mounting rings; a hole is horizontally provided on the long bolt screw, and the distance from the bottom of the hole to the top surface of the long bolt nut is greater than or equal to the sum of the thicknesses of the two mounting rings and the nut. A fastener is horizontally inserted into the hole, and the length of the fastener is greater than or equal to the inner diameter of the nut.

4. The prefabricated concrete-filled steel tubular column - reinforced concrete column equal-section connection joint according to claim 1, wherein A reinforcing plate is also fixed inside the reinforced concrete column. The reinforcing plate is cylindrical, and the outer wall of the reinforcing plate is fixedly connected to the inner wall of the reinforced concrete column through several plate members, and the steel bar is arranged inside the reinforcing plate.

5. The fabricated concrete-filled steel tubular column - reinforced concrete column equal-section connection joint according to claim 1, characterized in that, The steel pipe shell is a vertically arranged hollow rod-shaped structure, the inner diameter of the steel pipe shell is greater than or equal to the diameter of the steel bar, and the inner wall of the steel pipe of the concrete-filled steel tube column is fixedly connected to the steel pipe shell through a connecting plate.

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