CN218894194U - Precast column and superposed beam connection structure based on prestressed reinforcement - Google Patents
Precast column and superposed beam connection structure based on prestressed reinforcement Download PDFInfo
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- CN218894194U CN218894194U CN202223283862.9U CN202223283862U CN218894194U CN 218894194 U CN218894194 U CN 218894194U CN 202223283862 U CN202223283862 U CN 202223283862U CN 218894194 U CN218894194 U CN 218894194U
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Abstract
The utility model discloses a precast column and superposed beam connecting structure based on prestressed reinforcement, which comprises the following components: precast columns and precast superposed beams of reinforced concrete structures; a steel sleeve structure with a bracket type steel connecting box is fixed at the node area of the prefabricated column; the prefabricated superposed beam is provided with prestressed longitudinal steel bars positioned at the bottom of the beam; the prestress longitudinal steel bar is connected with the bracket type steel connecting box. The utility model adopts the prestress longitudinal steel bars, so the beam length is reduced by the crack width requirement, the frame structure system is not limited by the small column net any more, and the use space and the structural arrangement flexibility of the assembled frame structure system can be obviously improved. The steel bars and the steel boxes in the beam column connection node area act together, so that the plasticity performance of the steel boxes can be fully utilized, and the bending resistance, shearing resistance bearing capacity and ductility of the node are improved. The beam lower hanging type connection mode is adopted, so that the bearing capacity of beam column joints can be guaranteed, and the whole beam lower hanging type connection mode has the advantages of being simple and convenient to assemble and construct, good in stress performance and capable of meeting the requirement of large-space arrangement.
Description
Technical Field
The utility model belongs to the technical field of concrete buildings, and particularly relates to a precast column and superposed beam connecting structure based on prestressed reinforcement.
Background
Under the industrialized tide of China, the assembled building is greatly popular due to the characteristics of large-scale production of factories, guaranteed component quality, quick on-site installation and the like. In various assembly type connection modes, compared with the traditional assembly type connection mode, the box type connection has the advantages of high precision, good stress performance, convenience and rapidness in construction and the like, and has become a hot spot for current engineering practice application.
The box type connection technology can greatly reduce on-site wet operation, is beneficial to environmental protection, can reduce the use of construction period and manpower, further effectively reduces the cost, and can meet the development concept of green, environment-friendly, high-efficiency and energy-saving of the assembled building, so that the box type connection technology has received wide social attention.
However, the existing box-type connection nodes of the fabricated frame structure still have the following problems to be solved:
(1) The stress performance is insufficient: the connecting part of the precast beam column, namely the node core area, is the key part of structural stress. In the structure, the node part is in a stress state of the combined action of bending moment, shearing force and axial force. Therefore, the node core area component needs to be optimally designed to control the occurrence position of the plastic hinge in the earthquake so as to be positioned at the beam end position. The structure dissipates seismic energy by forming plastic hinges at the beam ends, prevents the column ends from being damaged, and avoids affecting the safety of the whole structure, namely meeting the common criteria of 'strong column and weak beam' and 'strong node and weak member' in the design criteria;
(2) The building scale is small: because the area of the pressed area of the assembled structural member is insufficient before pouring, tiny cracks are easy to appear at the bottom of the member, and the normal use limit state is not met. In this regard, the horizontal member size is generally controlled to avoid premature cracking, and thus, existing fabricated frame systems often employ a small mesh of posts. However, the building adopting the frame structure system is often a public building with certain requirements on the space of the building, such as schools, office buildings and the like, and is not in line with the current development situation that the assembled frame structure generally adopts a small column net.
(3) The construction is inconvenient: the beam column node of traditional assembled frame system often adopts prefabricated superposed beam both ends to place prefabricated post column top, carries out processes such as formwork erection, pouring to the post-cast layer again, although compare traditional cast in situ concrete system, promotes to some extent in the aspect of environmental protection and efficiency of construction etc. but the process still is complicated loaded down with trivial details, and is far away not novel box type connected form construction is convenient. However, the traditional box type connection has the problems of difficult positioning, design and production, high installation precision requirement and the like.
Therefore, the beam column box type connecting node for the laminated beam, which is simple and convenient to assemble and construct, good in stress performance and capable of meeting the requirement of large-space arrangement, is researched and designed, and has important significance for the development of the assembled building.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a prefabricated column and superposed beam connecting structure based on prestressed reinforcement. The technical problems to be solved by the utility model are realized by the following technical scheme:
a precast column and composite beam connection structure based on prestressed reinforcement, comprising:
precast columns and precast superposed beams of reinforced concrete structures; wherein, the prefabricated column is fixed with a steel sleeve structure with a bracket type steel connecting box; the prefabricated superposed beam is provided with prestressed longitudinal steel bars positioned at the bottom of the beam; the prestress longitudinal steel bars are connected with the bracket type steel connecting box.
Preferably, the steel sleeve structure comprises:
the steel column comprises a column steel sleeve, a plurality of lacing wires arranged in the column steel sleeve and a bracket type steel connecting box arranged on the outer surface of the column steel sleeve towards the direction of the prefabricated superposed beam; and a gap is formed in the surface, facing the direction of the prefabricated superposed beam, of the bracket type steel connecting box and is used for inserting the prestress longitudinal steel bars.
Preferably, the number of the gaps is two; the number of the prestressed longitudinal steel bars is two, and each prestressed longitudinal steel bar corresponds to one gap.
Preferably, the non-beam column connecting surface of the bracket type steel connecting box is hollow.
Preferably, the prestress steel bar is provided with a prestress steel bar clamp.
Preferably, the roof of the prefabricated superposed beam is provided with a plurality of stirrups downwards, including a first stirrup and a second stirrup; wherein the two-shaped stirrups are close to one side of the prefabricated column, and the lower parts of the two-shaped stirrups are welded on the horizontal end plate; the lower part of the one-type stirrup is connected with the prestressed longitudinal steel bar.
Preferably, the top of the bracket type steel connecting box is welded with the bottom of the horizontal end plate.
Preferably, the prefabricated superposed beam comprises a plurality of stirrups including two stirrups, and the stirrups are open stirrups with upper openings.
Preferably, the prestress longitudinal steel bar is a mantle fiber steel bar, and is connected with the bracket type steel connecting box through a nut.
Preferably, a washer is arranged between the bracket type steel connecting box and the nut.
Compared with the prior art, the connecting structure of the precast column and the superposed beam based on the prestressed reinforcement provided by the embodiment of the utility model has the following advantages:
(1) The prestress longitudinal steel bars based on box type connection are introduced into the assembled laminated beam, and a corresponding steel bar connection box, namely a steel sleeve structure with a bracket type steel connection box, is designed, and because the prestress steel bars are adopted, the width requirement of a crack on the beam length is reduced, so that a frame structure system is not limited by a small column net, the application range of the assembled frame structure is wider, and the application space and the structural arrangement flexibility of the assembled frame structure system can be obviously improved.
(2) The steel bars and the steel boxes in the beam column connection node area jointly act, the plasticity performance of the steel boxes is fully utilized, the bending resistance, the shearing resistance bearing capacity and the ductility of the nodes are improved, when a major earthquake occurs, the design concept of 'strong nodes and weak components' is met, and meanwhile the occurrence position of the plastic hinge is controlled in the beam end area of the nodes, so that more serious earthquake response results, namely the occurrence of column end damage, are avoided.
(3) The beam-down hanging type connection mode is adopted, so that the bearing capacity of beam-column nodes is guaranteed, the ductility performance of the nodes is improved, and the positioning requirement in the assembly construction process is met; and because of the existence of the bracket, the installation of the superposed beam is more convenient.
(4) The connection mode is simple, the work load of wet operation on the construction site is obviously reduced, the construction quality is reliable and controllable, the construction speed is high, the manpower can be saved, and the construction cost can be greatly saved.
Drawings
Fig. 1 is a schematic structural diagram of a connection structure between a precast column and a superposed beam based on prestressed reinforcement according to an embodiment of the present utility model;
fig. 2 is a schematic structural view of a connection structure of a precast column and a superposed beam based on prestressed reinforcement and a steel sleeve structure according to an embodiment of the present utility model;
fig. 3 (a) to 3 (c) are respectively a top view, a front view and a side view of a steel sleeve structure according to an embodiment of the present utility model;
FIG. 4 (a) is a front view of the internal construction of a prefabricated composite beam provided by an embodiment of the present utility model;
FIG. 4 (b) is a side view of the internal construction of a prefabricated composite beam at an angle according to an embodiment of the present utility model;
fig. 5 is a schematic view of a connection mode of a prefabricated laminated beam and a bracket type steel connection box on a prefabricated column according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to research and design a beam column box type connecting node of a prestressed composite beam, which is simple and convenient to assemble and construct, good in stress performance and capable of meeting the requirement of large-space arrangement, the embodiment of the utility model provides a prefabricated column and composite beam connecting structure based on prestressed reinforcement.
As shown in fig. 1, a connection structure between a precast column and a composite beam based on prestressed reinforcement according to an embodiment of the present utility model may include:
precast columns and precast superposed beams of reinforced concrete structures; wherein, the prefabricated column is fixed with a steel sleeve structure with a bracket type steel connecting box; the prefabricated superposed beam is provided with prestressed longitudinal steel bars positioned at the bottom of the beam; the prestress longitudinal steel bar is connected with the bracket type steel connecting box.
In fig. 1, 1 denotes a prefabricated column; 2, the prefabricated superposed beam is positioned on the upper longitudinal steel bar of the beam top; 3 represents a prefabricated laminated beam; 4 represents a prestressed longitudinal steel bar in the prefabricated superposed beam; 5, a steel sleeve structure with a bracket type steel connecting box; like reference numerals in the remaining drawings denote like meanings, and a description thereof will not be repeated.
Hereinafter, a concrete description will be given of a precast column, a precast composite beam, and the like.
Prefabricated column
The prefabricated column is a prefabricated concrete column and can be divided into an upper column and a lower column, and longitudinal steel bars are arranged in the upper column and the lower column. And, the longitudinal reinforcement at the boundary of the upper and lower columns may be set in an exposed state of unwrapped concrete.
Further, transverse stirrups may be provided in addition to the longitudinal bars of the prefabricated columns for fixing the longitudinal bars.
The steel sleeve structure with the bracket type steel connecting box can be fixed at the position of the lower column close to the boundary of the upper column and the lower column.
In an alternative embodiment, a steel sleeve structure comprises:
the steel column comprises a column steel sleeve, a plurality of lacing wires arranged in the column steel sleeve and a bracket type steel connecting box arranged on the outer surface of the column steel sleeve towards the direction of the prefabricated superposed beam.
The bracket type steel connecting box is provided with a gap on the surface facing the direction of the prefabricated superposed beam and is used for inserting the prestressed longitudinal steel bars.
It is understood that when the beam and column are connected, the prestressed longitudinal steel bars of the prefabricated laminated beam pass through the corresponding gaps on the bracket type steel connecting boxes, and then the prestressed longitudinal steel bars and the bracket type steel connecting boxes can be connected in a bolt connection mode.
The structure of the steel sleeve is understood with reference to the lower left-hand drawing of fig. 2, wherein 6 denotes a column steel sleeve; 7 represents a tie; 8, a bracket type steel connecting box; the parts may be pre-joined by welding. The column steel sleeve is used for surrounding the outer surface of the prefabricated column, the bracket type steel connecting box faces one side of the prefabricated superposed beam, the lacing wire is used for fixing the column steel sleeve and preventing the column steel sleeve from falling off or sliding along the column direction, and the direction of the lacing wire can be consistent with the extending direction of the bracket type steel connecting box.
With respect to the steel sleeve structure, please refer specifically to fig. 3 (a) to 3 (c) for providing a top view, a front view and a side view to understand the specific structure. And will not be described in any detail herein.
For the gaps arranged on the surface of the bracket type steel connecting box facing the direction of the prefabricated superposed beam, in an alternative implementation mode, the number of the gaps is two; correspondingly, the number of the prestressed longitudinal steel bars is two, and each prestressed longitudinal steel bar corresponds to one gap respectively.
In an alternative embodiment, the non-beam-column connection surface of the bracket-type steel connection box is hollow. The non-beam column connecting surface of the bracket type steel connecting box is two side surfaces of the bracket type steel connecting box, which are not connected with the column steel sleeve and the prefabricated superposed beam. The non-beam column connecting surface of the bracket type steel connecting box is arranged to be empty so as to facilitate the connection operation of the prestress longitudinal steel bars passing through the bracket type steel connecting box. Specifically, when the prestress longitudinal steel bar is connected with the bracket type steel connecting box by adopting the bolts, the non-beam column connecting surface of the bracket type steel connecting box is set to be empty, so that the bolt installation is facilitated.
In addition, as shown in fig. 1 to 3, two bracket type steel connection boxes are respectively arranged at two sides of the column steel sleeve, so that two prefabricated superposed beams can be respectively connected at two sides of the prefabricated column, and it is understood that the prefabricated superposed beams are only an alternative embodiment. In an alternative embodiment, the column steel jacket may be provided with a bracket type steel connection box on only one side, when the prefabricated column is to be connected to only one prefabricated composite beam on one side.
The preparation process of the prefabricated column specifically comprises the following steps: firstly, a steel template can be used for supporting the die, a steel sleeve structure is fixed at a corresponding position in the die and is used as a part of the template, so that the bracket type steel connecting box accords with the position corresponding to the beam top elevation and the longitudinal steel bar installation, and after the steel bar cage is bound, concrete is poured, and curing and forming are carried out to obtain the prefabricated column.
(II) prefabricated composite beam
The prefabricated laminated beam is a prefabricated concrete laminated beam.
In the utility model, a prestress steel bar clamp is arranged on a prestress longitudinal steel bar. Specifically, in the factory prefabrication stage, a prestress steel bar clamp is fixed on a superposed beam template, a pretensioning process is adopted to apply prestress to longitudinal steel bars at the bottom of the beam, and then the component is poured. Demoulding is carried out after the strength of the concrete is formed, and the prestressed reinforcement clamp is buried in the concrete.
In an optional implementation mode, a plurality of stirrups are arranged downwards at the beam top of the prefabricated superposed beam, and the stirrups comprise a first type stirrup and a second type stirrup; wherein, the two-shaped stirrups are close to one side of the prefabricated column and the lower part of the two-shaped stirrups are welded on the horizontal end plate; the lower part of the stirrup is connected with the prestressed longitudinal steel bar.
As will be appreciated by those skilled in the art, the one-piece stirrup is used to connect the longitudinal bars above and below the prefabricated composite beam, providing stability. In the utility model, the horizontal end plate welded with the two-type stirrup is arranged at the joint of the end part of the superposed beam and the bracket type steel connecting box, and the two-type stirrup is used for fixing the end part of the superposed beam, the reinforcing bracket type steel connecting box is connected with the beam end, and the horizontal end plate can also be used for resisting the local pressure of concrete at the groove.
In order to facilitate the connection construction of the beam and the column, in an alternative implementation mode, the prefabricated superposed beam comprises a plurality of stirrups including two stirrups, wherein the stirrups are open stirrups with upper openings. Wherein the number of open stirrups may be greater than the number of two types of stirrups.
In an alternative embodiment, the prestressed longitudinal steel bar is a mantle fiber steel bar, and is connected with the bracket type steel connection box through a nut.
On the basis, in order to prevent local compression damage, a gasket or a backing plate is further arranged between the bracket type steel connecting box and the nut.
For the internal structure of the prefabricated composite beam, please refer to fig. 4 (a) and fig. 4 (b). Fig. 4 (a) is a front view, and fig. 4 (b) is an isometric view. Wherein 2 represents the upper longitudinal steel bar of the prefabricated superposed beam positioned at the top of the beam; 4 represents a prestressed longitudinal steel bar in the prefabricated superposed beam; 9 represents a type I stirrup; 10 represents a second stirrup; 11 denotes a horizontal end plate; 12 represents a gasket; 13 denotes a nut; 14 denotes a prestressed reinforcement jig.
The preparation process of the prefabricated laminated beam specifically comprises the following steps: firstly, supporting a die, and placing beam end stirrups welded on a horizontal end plate at the beam end in advance, namely, two-type stirrups; pre-tensioning to pre-stress longitudinal steel bars at the bottom of the beam and fixing the pre-stress steel bar clamp on the steel template; fixing the rest one-type stirrups, binding to form a reinforcement cage, pouring concrete, and curing and molding.
(III) Beam column connection
For the connection between the prefabricated composite beam and the bracket-type steel connection box on the prefabricated column, please refer to fig. 5.
Wherein, the top of bracket formula steel connection box and the bottom welded connection of horizontal end plate.
The beam column connection process specifically comprises the following steps: hoisting the prefabricated superposed beam after installing the prefabricated column; the method comprises the steps of ensuring that prestressed longitudinal steel bars of a prefabricated laminated beam reserved at the bottom extend into double slits reserved by a bracket type steel connecting box, and connecting the prestressed longitudinal steel bars serving as mantle fiber steel bars through nuts; to prevent local compression failure, washers are used between the bracket steel connection box and the nut; and then, carrying out welding treatment on the horizontal end plate and the bracket type steel connecting box.
It should be noted that, in order to ensure a good engineering effect, the utility model has the following design points:
(1) The requirements of the manufacturing precision and the precision of the position of the column steel sleeve and the bracket type steel connecting box are met, so that the position accuracy of the structural member and the later installation can be ensured to be carried out smoothly.
(2) The prestress longitudinal steel bars at the bottom of the prefabricated superposed beam are reserved for being connected with the bracket type steel connecting box while the design prestress is guaranteed, and threading is carried out on the prestress longitudinal steel bars, so that nuts are conveniently installed later, and the threading length needs to meet the standard structural requirement.
In the prior art, no matter the traditional post-cast concrete or the novel box type connection is adopted for the assembled composite beam-column connection node, the use of prestress components, particularly prestress beams, under the requirement of large-scale space is not considered. Considering that in various beam column connection modes, the box type connection has the general characteristics of simple operation, short construction period and the like of dry type connection, and meets the general requirements of an assembled building. In order to solve the connection problem between the assembled beams and the assembled columns and improve the reliability of the beam and column connection, the scheme of the utility model specifically provides a novel box type connection method for a prefabricated superposed beam and a prefabricated concrete column based on the connection of prestressed reinforcement and nuts. The steel sleeve structure with the bracket type steel connecting box is reserved at the corresponding position of the precast concrete column, so that the steel sleeve structure is connected with the prestress longitudinal steel bars reserved at the bottom of the precast superposed beam.
In particular, compared with the prior art, the utility model has the following advantages:
(1) The prestress longitudinal steel bars based on box type connection are introduced into the assembled laminated beam, and a corresponding steel bar connection box, namely a steel sleeve structure with a bracket type steel connection box, is designed, and the prestress steel bars are adopted, so that the length of the beam is not limited by the requirement of crack width, a frame structure system is not limited by a small column net, the application range of the assembled frame structure is wider, and the application space and the structural arrangement flexibility of the assembled frame structure system can be obviously improved.
(2) The steel bars and the steel boxes in the beam column connection node area jointly act, the plasticity performance of the steel boxes is fully utilized, the bending resistance, the shearing resistance bearing capacity and the ductility of the nodes are improved, when a major earthquake occurs, the design concept of 'strong nodes and weak components' is met, and meanwhile the occurrence position of the plastic hinge is controlled in the beam end area of the nodes, so that more serious earthquake response results, namely the occurrence of column end damage, are avoided.
(3) The beam-down hanging type connection mode is adopted, so that the bearing capacity of beam-column nodes is guaranteed, the ductility performance of the nodes is improved, and the positioning requirement in the assembly construction process is met; and because of the existence of the bracket, the installation of the superposed beam is more convenient.
(4) The connection mode is simple, the work load of wet operation on the construction site is obviously reduced, the construction quality is reliable and controllable, the construction speed is high, the manpower can be saved, and the construction cost can be greatly saved.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.
Claims (10)
1. Precast column and composite beam connection structure based on prestressing steel, its characterized in that includes:
precast columns and precast superposed beams of reinforced concrete structures; wherein, the prefabricated column is fixed with a steel sleeve structure with a bracket type steel connecting box; the prefabricated superposed beam is provided with prestressed longitudinal steel bars positioned at the bottom of the beam; the prestress longitudinal steel bars are connected with the bracket type steel connecting box.
2. The prestressed reinforcement-based precast column and composite girder connection structure of claim 1, wherein the steel sleeve structure comprises:
the steel column comprises a column steel sleeve, a plurality of lacing wires arranged in the column steel sleeve and a bracket type steel connecting box arranged on the outer surface of the column steel sleeve towards the direction of the prefabricated superposed beam; and a gap is formed in the surface, facing the direction of the prefabricated superposed beam, of the bracket type steel connecting box and is used for inserting the prestress longitudinal steel bars.
3. The prestressed reinforcement-based precast column and composite beam connecting structure of claim 2, wherein the number of the slits is two; the number of the prestressed longitudinal steel bars is two, and each prestressed longitudinal steel bar corresponds to one gap.
4. The prestressed reinforcement-based precast column and composite beam connecting structure of claim 1, wherein the non-beam column connecting surface of the bracket-type steel connecting box is empty.
5. The prestressed reinforcement-based connection structure of a precast column and a composite beam according to claim 1, wherein the prestressed longitudinal reinforcement is provided with a prestressed reinforcement jig.
6. The connection structure of the precast column and the superposed beam based on the prestressed reinforcement as claimed in claim 1, wherein a plurality of stirrups are arranged downwards at the beam top of the precast superposed beam, and the stirrups comprise a first type stirrup and a second type stirrup; wherein the two-shaped stirrups are close to one side of the prefabricated column, and the lower parts of the two-shaped stirrups are welded on the horizontal end plate; the lower part of the one-type stirrup is connected with the prestressed longitudinal steel bar.
7. The prestressed reinforcement-based precast column and composite beam connecting structure of claim 6, wherein the top of the bracket-type steel connecting box is welded with the bottom of the horizontal end plate.
8. The prestressed reinforcement-based connection structure of a precast column and a composite beam of claim 6, wherein a plurality of stirrups of the precast composite beam including a two-type stirrup are open stirrups with upper openings.
9. The prestressed reinforcement-based connection structure of a precast column and a composite beam according to claim 1, wherein the prestressed longitudinal reinforcement is a mantle fiber reinforcement, and is connected with the bracket type steel connection box through a nut.
10. The prestressed reinforcement-based precast column and composite beam connecting structure of claim 9, wherein a washer is provided between the bracket type steel connecting box and the nut.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223283862.9U CN218894194U (en) | 2022-12-07 | 2022-12-07 | Precast column and superposed beam connection structure based on prestressed reinforcement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223283862.9U CN218894194U (en) | 2022-12-07 | 2022-12-07 | Precast column and superposed beam connection structure based on prestressed reinforcement |
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| CN218894194U true CN218894194U (en) | 2023-04-21 |
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| CN202223283862.9U Active CN218894194U (en) | 2022-12-07 | 2022-12-07 | Precast column and superposed beam connection structure based on prestressed reinforcement |
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