CN216108029U - Self-resetting long round steel pipe restrained reinforced concrete column base joint - Google Patents
Self-resetting long round steel pipe restrained reinforced concrete column base joint Download PDFInfo
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- CN216108029U CN216108029U CN202122254810.8U CN202122254810U CN216108029U CN 216108029 U CN216108029 U CN 216108029U CN 202122254810 U CN202122254810 U CN 202122254810U CN 216108029 U CN216108029 U CN 216108029U
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Abstract
The utility model relates to a self-resetting long round steel pipe restrained reinforced concrete column base node which comprises a foundation and a long round steel pipe column, wherein a column reinforcement cage is pre-embedded in the long round steel pipe column; the column steel reinforcement cage comprises a plurality of column longitudinal reinforcements I, a plurality of column hoops and two column longitudinal reinforcements II which are symmetrically distributed on short sides of two sides of the column steel reinforcement cage, foundation embedded longitudinal reinforcements are embedded in the foundation, the lower end of each column longitudinal reinforcement I is connected with SMA bars through a sleeve, a bonding removal layer is sleeved on each SMA bar, and the lower end of each SMA bar is connected with the corresponding foundation embedded longitudinal reinforcement through a sleeve; each column longitudinal rib II is connected with the corresponding foundation embedded longitudinal rib through a sleeve. The device is safe and reliable, has definite force transmission, can restore after earthquake, does not influence the normal use of a bridge system, and is convenient for the development of disaster relief work after earthquake.
Description
Technical Field
The utility model relates to the technical field of bridges, in particular to a self-resetting long round steel pipe restrained reinforced concrete column base node.
Background
In an earthquake disaster prevention system, a bridge system is an important lifeline, and plays a role of a transportation hub by connecting a plurality of important buildings such as hospitals, fire stations, schools, public refuges and the like which are required for maintaining life and property safety. Therefore, the bridge system needs to maintain the due transportation function under the action of the earthquake. If the bridge is damaged in an earthquake and loses the transportation function, life casualties and property loss are caused, and disaster relief and reconstruction work is also influenced.
The column base is an important node for connecting the concrete-filled steel tube bridge pier with the foundation, the connection rigidity of the column base is closely related to the stability of the structure and the structural member, and the column base has important influence on the internal force and the displacement of the structure and is a main factor for determining the stable bearing capacity and the horizontal anti-seismic bearing capacity of the structure. Concrete filled steel tubes in the foot portion of the column from the presence to the absence of concrete cause structural discontinuities which, if not properly treated in this portion, are susceptible to failure resulting in failure of the overall superstructure. The existing data can not directly guide the design and construction of the column base node of the project. Therefore, the bearing performance of the column base node of the steel tube concrete pier with the long circular section needs to be systematically and comprehensively researched, reasonable construction measures of the column base node are provided, and the common stress of the steel tube concrete pier and the concrete bearing platform is ensured.
Because the relevant standard regulations of the existing steel tube concrete members at home and abroad only stipulate the construction measures of column base nodes with circular sections and square sections, the existing data can not directly guide the design and construction of the column base nodes of the project. Therefore, the bearing performance of the column base node of the steel tube concrete pier with the long circular section needs to be systematically and comprehensively researched, reasonable construction measures of the column base node are provided, and the common stress of the steel tube concrete pier and the concrete bearing platform is ensured.
The temperature stress generated by the structure under the action of temperature can cause overlarge basic size and economic waste if corresponding measures are not taken. The common types of connections between components include grouted corrugated pipe connections, grouted casing connections, post-tensioned tendon connections, and socket connections. Due to the presence of the connection joints, the integrity of the bridge structure under large cyclic deformation conditions depends on the reliability and hysteresis of the joints. In recent years, researchers have studied seismic behavior for different types of connections. Of these types of connections, grout sleeves are considered to be one of the best choices for the preform.
SUMMERY OF THE UTILITY MODEL
In view of the above, the utility model aims to provide a self-resetting long round steel pipe restrained reinforced concrete column base joint which is safe, reliable, clear in force transmission, simple and convenient to construct and recoverable in deformation after an earthquake.
The utility model is realized by adopting the following scheme: a self-resetting long round steel pipe constraint reinforced concrete column base node comprises a foundation and a long round steel pipe column which is located on the upper side of the foundation and has a long round section, a column reinforcement cage is pre-embedded in the long round steel pipe column, a square steel pipe is arranged at the bottom in the long round steel pipe column, the lower end of the square steel pipe is attached to the upper side face of the foundation, HPFRCC is filled in an annular region between the square steel pipe and the long round steel pipe column, and column concrete is filled in the square steel pipe and the long round steel pipe column in the region above the square steel pipe; the column steel reinforcement cage comprises a plurality of column longitudinal reinforcements I, a plurality of column hoops and two column longitudinal reinforcements II which are symmetrically distributed on short sides of two sides of the column steel reinforcement cage, foundation embedded longitudinal reinforcements which extend out of the upper side face of the foundation and correspond to the column longitudinal reinforcements I and the column longitudinal reinforcements II are embedded in the foundation, the lower end of each column longitudinal reinforcement I is connected with SMA rods through sleeves, a bonding removing layer is sleeved on each SMA rod, and the lower end of each SMA rod is connected with the corresponding foundation embedded longitudinal reinforcement through a sleeve; each column longitudinal rib II is connected with the corresponding foundation embedded longitudinal rib through a sleeve.
Further, the CFST post has been buried underground in the middle of the post concrete in the square steel pipe, during CFST post lower extreme upwards extended and inserted the basis, the outside parcel of CFST post has RPC parcel layer.
Furthermore, a plurality of steel pipes are arranged in the square steel pipe, the lower ends of the steel pipes extend downwards and are embedded in the foundation, and the upper ends of the steel pipes extend upwards and are embedded in the column concrete above the square steel pipes; the depth of the steel pipe embedded into the foundation is the same as the depth of the foundation embedded longitudinal bar, and the diameter of the steel pipe is 0.5 times of that of the CFST column; the diameter of the CFST column is 0.5 times of the side length of the square steel pipe, and the depth of the CFST column inserted into the foundation is 3 times of the diameter of the CFST column.
Further, the outer diameter of the short side of the long round steel pipe column is D, the heights of the square steel pipe and the HPFRCC are the same as the outer diameter of the short side of the long round steel pipe column, and the side length of the square steel pipe is 2/3 of the outer diameter of the short side of the long round steel pipe column; the length of the SMA bar is L, and L = 0.3D; and the single axial tension bearing capacity of the SMA bar is not less than that of the single column longitudinal rib I.
Furthermore, an embedded plate is embedded at the periphery of the long round steel pipe column at the upper side of the foundation, and an anchor bolt with the upper end penetrating out of the upper side surface of the foundation is embedded in the foundation; the periphery of the lower end of the long round steel pipe column is welded with a column base bottom plate positioned above the embedded plate, the embedded plate is provided with an anchor bolt hole corresponding to the anchor bolt, the column base bottom plate is provided with a long hole corresponding to the anchor bolt, and the upper end of the anchor bolt is connected with a locking nut for compressing the column base bottom plate.
Furthermore, a first PFA plate is clamped between the embedded plate and the column base bottom plate, and an anchor bolt base plate and a second PFA plate are arranged between the locking nut and the column base bottom plate; and the embedded plate is also welded with a limit baffle positioned at the periphery of the column base bottom plate.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the used SMA bar can transfer bending moment and axial force in a node area, is safe and reliable, has definite force transfer, can restore after earthquake, does not influence the normal use of a bridge system, and is convenient for the development of disaster relief work after earthquake;
(2) the SMA bar and the HPFRCC material are only locally applied to the column base node, so that the economy is ensured on the basis of ensuring the mechanical property of the node;
(3) the inner steel pipe and the outer steel pipe are used, so that the bending resistance and the tensile strength of the structure are improved, and the consumption of high-performance concrete is reduced;
(4) the pier and the foundation can be connected safely and reliably, construction is simple and convenient, temperature stress is effectively released, the foundation counter force is large, the situation that the foundation is difficult to design and construct due to overlarge column base counter force is avoided, the reduction of the size of the section of the foundation and foundation reinforcement is facilitated, and good economic benefit is achieved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a sectional view taken along line A-A in FIG. 1
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic view showing the connection of a column longitudinal bar I, an SMA bar and a foundation embedded longitudinal bar in the embodiment of the utility model;
FIG. 5 is a schematic view of a CFST column attached to an RPC encapsulation layer in an embodiment of the present invention;
FIG. 6 is a top view of an embodiment of the present invention;
FIG. 7 is a partial schematic view of the anchor connection;
the reference numbers in the figures illustrate: 1-long steel pipe column, 2-column reinforcement cage, 201-column longitudinal reinforcement I, 202-column stirrup, 203-column longitudinal reinforcement II, 3-square steel pipe, 4-steel pipe, 5-foundation, 6-foundation embedded longitudinal reinforcement, 7-column concrete, 8-HPFRCC, 9-CFST column, 10-RPC wrapping layer, 11-SMA bar, 12-bonding layer, 13-sleeve, 14-column base bottom plate, 15-long hole, 16-anchor bolt, 17-embedded plate, 18-limit baffle, 19-anchor bolt hole, 20-first PFA plate, 21-second plate and 22-anchor bolt backing plate.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 7, the self-resetting oblong steel tube restrained reinforced concrete column base node comprises a foundation 5 and an oblong steel tube column 1 which is located on the upper side of the foundation 5 and has an oblong cross section, a column reinforcement cage 2 is pre-embedded in the oblong steel tube column 1, a square steel tube 3 is arranged at the bottom in the oblong steel tube column 1, the lower end of the square steel tube 3 is attached to the upper side surface of the foundation 5, an annular area between the square steel tube 3 and the oblong steel tube column 1 is filled with HPFRCC8, and column concrete 7 is filled in the square steel tube 3 and the oblong steel tube column above the square steel tube; the column steel reinforcement cage 2 comprises a plurality of column longitudinal reinforcements I201, a plurality of column hoops 202 and two column longitudinal reinforcements II 203 which are symmetrically distributed on short sides of two sides of the column steel reinforcement cage, foundation embedded longitudinal reinforcements 6 which extend out of the upper side face of the foundation and correspond to the column longitudinal reinforcements I and the column longitudinal reinforcements II are embedded in the foundation, the lower end of each column longitudinal reinforcement I is connected with an SMA rod 11 through a sleeve 13, a bonding removal layer 12 is sleeved on each SMA rod 11, and the lower end of each SMA rod 11 is connected with the corresponding foundation embedded longitudinal reinforcements 6 through the sleeve 13; each column longitudinal rib II 203 is connected with the corresponding foundation embedded longitudinal rib 6 through a sleeve 13; the SMA bar used by the column base node can transfer bending moment and axial force in a node area, is safe and reliable, has definite force transfer, can restore after earthquake deformation, does not influence the normal use of a bridge system, and is convenient for the development of disaster relief work after earthquake; the SMA bar and the HPFRCC material are only locally applied to the column base node, so that the economy is ensured on the basis of ensuring the mechanical property of the node; meanwhile, the inner steel pipe and the outer steel pipe are used, so that the bending resistance and the tensile strength of the structure are improved, the consumption of high-performance concrete is reduced, the safe and reliable connection between the pier and the foundation can be realized, the self-resetting function of the pier column is realized, and the construction is simple and convenient.
The SMA bar 11 is made of Shape Memory Alloy (SMA), which has limited Shape Memory effect and superelasticity, and recoverable deformation of 6% -7%, and in addition, the Shape Memory Alloy (SMA) has the advantages of fatigue resistance, good corrosion resistance, good damping performance in an ultra-low frequency range, and the like.
The HPFRCC is concrete in a plastic hinge area, and the HPFRCC is a High-Performance Fiber Reinforced Cement-based Composite material (High Performance Fiber Reinforced Cement Composite) which has higher ultimate tensile strain, better compression resistance, better freeze-thaw cycle resistance, better expansion resistance and better crack control effect compared with common concrete.
RPC is Reactive Powder Concrete (Reactive Powder Concrete) which is a cement-based material with ultrahigh strength, high durability, high toughness and good volume stability. And the adhesive has good fluidity and bonding strength and high construction tolerance, and ensures the reliability and construction speed of a joint area.
In this embodiment, the lower end of the column longitudinal rib i 201, the lower end of the column longitudinal rib ii 203, the two ends of the SMA bar 11 and the upper end of the foundation embedded longitudinal rib 6 are all tapped.
In the embodiment, a CFST column 9 is embedded in the middle of column concrete in the square steel pipe 3, the lower end of the CFST column extends upwards and is inserted into a foundation, and an RPC wrapping layer 11 wraps the CFST column; the anti-seismic performance of CFST connection is used, RPC grouting is adopted for integration, and the interface bonding performance and the lateral constraint condition are improved.
In the embodiment, a plurality of steel pipes 4 are further arranged in the square steel pipe, the lower ends of the steel pipes extend downwards and are embedded in the foundation, and the upper ends of the steel pipes extend upwards and are embedded in the column concrete above the square steel pipes; the depth of the steel pipe embedded into the foundation is the same as the depth of the foundation embedded longitudinal bar, and the diameter of the steel pipe is 0.5 times of that of the CFST column; the diameter of the CFST column is 0.5 times of the side length of the square steel pipe, and the depth of the CFST column inserted into the foundation is 3 times of the diameter of the CFST column.
In this embodiment, the outer diameter of the short side of the long round steel pipe column is D, the heights of the square steel pipe and the HPFRCC are both the same as the outer diameter of the short side of the long round steel pipe column, and the side length of the square steel pipe is 2/3 of the outer diameter of the short side of the long round steel pipe column; the length of the SMA bar is L, and L = 0.3D; and the single axial tension bearing capacity of the SMA bar is not less than that of the single column longitudinal rib I.
In the embodiment, an embedded plate 17 is embedded at the periphery of the long round steel pipe column at the upper side of the foundation, and an anchor bolt 16 with the upper end penetrating out from the upper side surface of the foundation is embedded in the foundation; the periphery of the lower end of the long round steel pipe column is welded with a column base bottom plate 14 positioned above the embedded plate, the embedded plate is provided with an anchor bolt hole 19 corresponding to the anchor bolt, the column base bottom plate is provided with a long hole 15 corresponding to the anchor bolt, and the upper end of the anchor bolt is connected with a locking nut for compressing the column base bottom plate.
In this embodiment, a first PFA plate 20 is sandwiched between the embedded plate and the column base bottom plate, and an anchor bolt backing plate 22 and a second PFA plate 21 are disposed between the lock nut and the column base bottom plate; the embedded plate is also welded with a limit baffle 18 positioned at the periphery of the column base bottom plate; the first PFA plate 20 is 10mm thick and the second PFA plate 21 is 5mm thick.
PFA plates (Polyfluoroakoxy), commonly known as clear Teflon or soluble Teflon, have a melting point of about 580F and a density of 2.13 to 2.16 g/cc. PFA is similar to PTFE and FEP, but above 302T, the mechanical properties are slightly better than FEP and can be used at temperatures up to 500F, with chemical resistance comparable to that of PTEF. Almost unlimited chemical resistance wide working temperature range from-190 ℃ to + 260 ℃, stress cracking resistance of ultra-low permeation value, wear resistance of ultra-low precipitation value for high purity application, excellent aging stability, ultraviolet resistance, higher dielectric value and piezoelectric value of beta rays and gamma rays, and clearness (translucence).
Through the special treatment to the column foot node connection position, can release temperature stress effectively, the great problem of basis counter-force has avoided taking place because of the difficult design of the difficult condition of constructing that the column foot counter-force is too big causes, helps reducing basis cross-sectional dimension and basic arrangement of reinforcement, has good economic benefits.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the utility model discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a restrict reinforced concrete column base node from long round steel pipe that restores to throne which characterized in that: the column steel reinforcement cage comprises a foundation and a long steel pipe column which is located on the upper side of the foundation and has a long circular section, wherein a column steel reinforcement cage is pre-embedded in the long steel pipe column, the column steel reinforcement cage comprises a plurality of column longitudinal reinforcements I, a plurality of column hoops and two column longitudinal reinforcements II which are symmetrically distributed on short sides of two sides of the column steel reinforcement cage, foundation pre-embedded longitudinal reinforcements which extend out of the upper side face of the foundation and correspond to the column longitudinal reinforcements I and the column longitudinal reinforcements II are pre-embedded in the foundation, the lower end of each column longitudinal reinforcement I is connected with SMA rods through sleeves, each SMA rod is sleeved with a bonding layer, and the lower end of each SMA rod is connected with the corresponding foundation pre-embedded longitudinal reinforcement through a sleeve; each column longitudinal rib II is connected with the corresponding foundation embedded longitudinal rib through a sleeve.
2. The self-resetting long round steel pipe restrained reinforced concrete column base node of claim 1, characterized in that: a square steel pipe is arranged at the bottom in the long round steel pipe column, the lower end of the square steel pipe is attached to the upper side surface of the foundation, HPFRCC is filled in an annular region between the square steel pipe and the long round steel pipe column, and column concrete is filled in the square steel pipe and the long round steel pipe column in the region above the square steel pipe; the CFST post has been buried underground in the middle of the post concrete in the square steel pipe, during CFST post lower extreme upwards extended and inserted the basis, the outside parcel of CFST post has RPC parcel layer.
3. The self-resetting long round steel pipe restrained reinforced concrete column base node of claim 2, characterized in that: the lower ends of the steel pipes extend downwards and are embedded in the foundation, and the upper ends of the steel pipes extend upwards and are embedded in the column concrete above the square steel pipes; the depth of the steel pipe embedded into the foundation is the same as the depth of the foundation embedded longitudinal bar, and the diameter of the steel pipe is 0.5 times of that of the CFST column; the diameter of the CFST column is 0.5 times of the side length of the square steel pipe, and the depth of the CFST column inserted into the foundation is 3 times of the diameter of the CFST column.
4. The self-resetting long round steel pipe restrained reinforced concrete column base node of claim 2, characterized in that: the outer diameter of the short side of the long round steel pipe column is D, the heights of the square steel pipe and the HPFRCC are the same as the outer diameter of the short side of the long round steel pipe column, and the side length of the square steel pipe is 2/3 of the outer diameter of the short side of the long round steel pipe column; the length of the SMA bar is L, and L = 0.3D; and the single axial tension bearing capacity of the SMA bar is not less than that of the single column longitudinal rib I.
5. The self-resetting long round steel pipe restrained reinforced concrete column base node of claim 1, characterized in that: an embedded plate is embedded in the periphery of the long round steel pipe column at the upper side of the foundation, and an anchor bolt with the upper end penetrating out from the upper side of the foundation is embedded in the foundation; the periphery of the lower end of the long round steel pipe column is welded with a column base bottom plate positioned above the embedded plate, the embedded plate is provided with an anchor bolt hole corresponding to the anchor bolt, the column base bottom plate is provided with a long hole corresponding to the anchor bolt, and the upper end of the anchor bolt is connected with a locking nut for compressing the column base bottom plate.
6. The self-resetting long round steel pipe restrained reinforced concrete column base node of claim 5, characterized in that: a first PFA plate is clamped between the embedded plate and the column base bottom plate, and an anchor bolt base plate and a second PFA plate are arranged between the locking nut and the column base bottom plate; and the embedded plate is also welded with a limit baffle positioned at the periphery of the column base bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122254810.8U CN216108029U (en) | 2021-09-17 | 2021-09-17 | Self-resetting long round steel pipe restrained reinforced concrete column base joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122254810.8U CN216108029U (en) | 2021-09-17 | 2021-09-17 | Self-resetting long round steel pipe restrained reinforced concrete column base joint |
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| CN216108029U true CN216108029U (en) | 2022-03-22 |
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| CN202122254810.8U Active CN216108029U (en) | 2021-09-17 | 2021-09-17 | Self-resetting long round steel pipe restrained reinforced concrete column base joint |
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