Fabricated concrete frame beam column dry type connecting joint

Abstract

The invention relates to the technical field of concrete frame structures, and discloses a fabricated concrete frame beam-column dry-type connecting joint which comprises a prefabricated concrete column and a prefabricated concrete beam, and an upper groove area and a lower groove area of the end, connected with the prefabricated concrete column, of the prefabricated concrete beam are joint areas. The back surface of the steel block is detachably and fixedly connected with the prefabricated concrete column; a plurality of deformed steel bars are embedded in the precast concrete beam, and the parts, penetrating out of the precast concrete beam, of the deformed steel bars are detachably and fixedly connected to the precast concrete column through steel blocks. Cushion blocks, high-ductility steel bars and connectors are embedded in the prefabricated concrete columns, the steel blocks are connected with the prefabricated concrete columns, and the deformed steel bars are detachably connected with the hexagon nuts. The dry type connecting joint has the advantages of being simple in structure, good in anti-seismic performance and low in economic cost, complex construction steps are reduced, the construction difficulty is lowered, the construction efficiency is improved, the joint adopts a high-strength connecting piece, and the strength and stability of joint connection are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of concrete frame structures, and in particular to an assembled concrete frame beam-column dry connection node. Background Art

[0002] With the advancement of building industrialization, under the active advocacy of the country to vigorously develop prefabricated buildings, prefabricated buildings have gradually become an important development direction of the construction industry due to their advantages such as fast construction speed, high production efficiency and low environmental impact. As an important part of the prefabricated concrete frame structure, its node connection method is crucial to the performance of the overall structure.

[0003] Prefabricated concrete frame beam-column connection nodes can be divided into dry connection and wet connection according to the construction process. Currently known prefabricated concrete beam-column dry connection nodes are mainly divided into three types: bracket connection, tongue-and-groove connection and bolt connection or welding connection.

[0004] Among them, the corbel connection is a common form of dry connection. It sets a corbel (i.e., a supporting and fixing structure extending out of the column) at the beam-column node, overlaps the beam on the corbel, and connects it by bolts or welding. However, under the action of seismic loads, since the corbel connection uses a reserved channel to penetrate the steel bar for assembly, the anchoring performance of the steel bar often cannot meet the requirements, and the anchor steel bar may be pulled out, that is, the seismic performance is poor, the energy dissipation capacity is poor, and the exposed corbel occupies a large space, affecting the appearance.

[0005] In the tongue-and-groove connection, the ends of the precast beam and precast column are reserved with a tongue and a groove respectively, and the connection is achieved by the close fit of the concave and convex grooves. In order to ensure the firmness of the connection, a connector or filler, such as a welded cover plate, a rubber pad, etc., can also be set between the tongue and the groove. However, the tongue-and-groove connection requires high processing accuracy, and it is necessary to ensure that the tongue and groove sizes of the precast beam and precast column match accurately, otherwise it will affect the connection effect.

[0006] Bolted connection and welded connection are also common dry connection forms. Bolted connection uses bolts to fasten the connectors at the beam-column joints together. Although the installation process is relatively simple, its internal structure is very complex, with high precision requirements and the risk of connection failure. Welded connection uses welding to weld the connectors together, which has the disadvantages of difficult to control weld quality, high weld point rigidity, insufficient ductility, and poor seismic performance.

[0007] In summary, the problems existing in the prior art are as follows: the prefabricated concrete frame beam-column connection nodes need to be designed and manufactured according to the specific project, which increases the complexity and difficulty of the design. In addition, some nodes have high precision requirements, and the construction is cumbersome. The complex design and construction will also increase the cost. The structure of the node area of ​​the prefabricated concrete frame beam-column connection node is complex, and its seismic performance may be affected to a certain extent.

[0008] Invention patent content

[0009] The purpose of the present invention is to provide a prefabricated concrete frame beam-column dry connection node with simple design, convenient construction, low cost, good earthquake resistance and high safety performance.

[0010] To achieve the above object, the present invention provides the following solutions:

[0011] A prefabricated concrete frame beam-column dry connection node comprises a precast concrete column and a precast concrete beam, wherein the upper groove area and the lower groove area at the end where the precast concrete beam is connected to the precast concrete column are node areas, and further comprises a steel block whose back side is detachably fixedly connected to the connection side of the precast concrete column; a plurality of threaded steel bars are embedded in the precast concrete beam, and the portion of the threaded steel bars passing through the precast concrete beam is detachably fixedly connected to the precast concrete column via the steel block.

[0012] Furthermore, a bolt hole one and a threaded steel hole one are provided on one side where the precast concrete column is connected to the precast concrete beam, and the two threaded steel holes one are located between the two bolt holes one.

[0013] Furthermore, a high-ductility steel rod and a joint are pre-buried in the precast concrete column along the extension direction of the bolt hole 1, and the high-ductility steel rod and the joint are detachably fixedly connected.

[0014] Furthermore, a pad is provided on one side of the high ductility steel rod close to the surface of the precast concrete column, and the pad is used to adjust the parallelism of the high ductility steel rod so that it is aligned with the second bolt hole on the steel block, and the pad is pre-embedded in the precast concrete column.

[0015] Furthermore, the steel block is penetrated by two bolt holes 2 and two threaded steel holes 2, and the two threaded steel holes 2 are located between the two bolt holes 2; the two bolt holes 2 correspond one-to-one with the two bolt holes, and the two threaded steel holes 2 correspond one-to-one with the two threaded steel holes.

[0016] Furthermore, the steel block cooperates with the pre-buried pads, high-ductility steel rods and joints in the precast concrete column through bolts and gaskets, so that the steel block is detachably fixedly connected to the precast concrete column.

[0017] Furthermore, two threaded steel bars are symmetrically embedded in the precast concrete beam, and the two threaded steel bars pass through the precast concrete beam and are detachably fixedly connected with hexagonal nuts in the upper groove area and the lower groove area respectively.

[0018] Furthermore, the portion of each threaded steel bar that passes through the hexagonal nut passes through the threaded steel hole 2 on the steel block and is fixedly inserted into the threaded steel hole 1 of the precast concrete column, and the back side of the hexagonal nut is connected to the steel block.

[0019] According to the specific embodiment provided by the present invention, the assembled concrete frame beam-column dry connection node provided by the present invention discloses the following technical effects:

[0020] 1. Low cost: Compared with wet connection, the present invention does not require too much additional concrete pouring and maintenance costs, thereby reducing the overall construction cost. In addition, it can also reduce the rework and repair costs caused by improper concrete pouring, thereby achieving the purpose of saving materials and reducing costs.

[0021] 2. Convenient construction: The operation of bolt connection is relatively simple. You only need to pass the bolts through the bolt holes of the steel blocks and fasten them with the high-ductility steel bars embedded in the columns. Fix the steel blocks on the side of the columns. When installing precast concrete beams, insert the threaded steel through the threaded steel holes on the steel blocks and embed them into the precast concrete columns. This operation method greatly reduces the technical requirements for workers and improves construction efficiency.

[0022] 3. Strong energy absorption capacity: Steel blocks are used in the node areas of precast concrete beams and precast concrete columns, which are connected by hexagonal bolts and threaded steel bars. Under the action of seismic loads, the threaded steel bars run through the entire beam-column node, which can effectively enhance the energy absorption capacity of the beam-column node.

[0023] 4. Good seismic performance: Although the dry connection may be slightly inferior to the wet connection in terms of overall seismic performance, the invention gives full play to the connection mode of bolts and steel blocks and arranges the position of threaded steel bars reasonably, significantly improving the seismic resistance of the overall structure. When natural disasters such as earthquakes occur, the stability and integrity of the structure can still be maintained.

[0024] 5. Green and environmentally friendly: This invention reduces the amount of wet work on the construction site, thereby reducing dust and noise pollution, and the components are prefabricated in the factory, reducing the generation of construction waste on the construction site. This helps to improve the construction environment and protect the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 It is a structural schematic diagram of the dry-type connection node of the assembled concrete frame beam-column of the present invention;

[0027] Figure 2 for Figure 1 Front view of the precast concrete column;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure of the steel block;

[0029] Figure 4 for Figure 1 Schematic diagram of the assembly structure of the central bolt and the embedded components in the precast concrete column;

[0030] Figure 5 for Figure 1 A schematic diagram of the structure in which the steel block is detachably fixedly connected to the embedded parts in the precast concrete column by bolts;

[0031] Figure 6 for Figure 1 Schematic diagram of the connection between embedded threaded steel and hexagonal nuts in precast concrete beams.

[0032] Description of reference numerals:

[0033] 1. Precast concrete column; 11. Bolt hole one; 12. Threaded steel hole one; 2. Precast concrete beam; 3. Spacer; 4. High ductility steel rod; 5. Joint; 6. Bolt; 7. Washer; 8. Steel block; 81. Bolt hole two; 82. Threaded steel hole two; 9. Threaded steel; 10. Hexagonal nut. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of invention patents, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "center", "longitudinal", "lateral", "vertical", "horizontal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. When an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time.

[0036] The purpose of the present invention is to provide a prefabricated concrete frame beam-column dry connection node, which reduces complex construction steps, reduces construction difficulty, and thus improves construction efficiency, and the node adopts high-strength connectors to ensure the strength and stability of the node connection. The node has a simple structure, good seismic performance, and low economic cost.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, the present invention is a prefabricated concrete frame beam-column dry connection node, comprising a precast concrete column 1 and a precast concrete beam 2. The upper groove area and the lower groove area of ​​the end where the precast concrete beam 2 is connected to the precast concrete column 1 are the node area, and also include a column side steel block 8 whose back side is detachably fixedly connected to the connection side of the precast concrete column 1. The steel block 8 is fixed to the precast concrete column 1 with bolts 6. A plurality of threaded steel bars 9 are embedded in the precast concrete beam 2, and the part of the threaded steel bar (9) passing through the precast concrete beam 2 is detachably fixedly connected to the precast concrete column 1 through the steel block 8.

[0039] like Figure 2 As shown, the precast concrete column 1 has four holes reserved in the node area, the two outer holes are bolt holes 11 for the embedded high-ductility steel bars, and the two middle holes are reserved threaded steel holes 12.

[0040] like Figure 3 As shown, the steel block 8 is provided with two bolt holes 81 and two threaded steel holes 82 , wherein the two outer holes are bolt holes 81 , and the two middle holes are threaded steel holes 82 .

[0041] like Figure 4-5As shown, the high ductility steel rod 4 and the joint 5 are detachably fixedly connected, and the pad 3 and the detachable fixed connection parts, the high ductility steel rod 4 and the joint 5 are pre-embedded in the precast concrete column 1. Preferably, placing the pad 3 can effectively solve the problem of the difference in parallelism between the steel block 8 and the connection surface of the high ductility steel rod 4 pre-embedded in the precast concrete column 1, ensure the tightness and stability of the connection, and to a certain extent enhance the strength of the bolt connection, making it more stable. Specifically, the steel block 8 is detachably fixedly connected to the side of the pre-supported concrete column by the bolt 6 and the gasket 7 cooperating with the pad 3 and the connection parts, the high ductility steel rod 4 and the joint 5 pre-embedded in the precast concrete column 1, and the gasket 7 is added between the bolt 6 and the steel block 8, which reasonably increases the contact area, makes the force more uniform, and improves the friction between the bolt 6 and the steel block 8, making the node more reliable, and under the action of seismic load, can effectively enhance its energy dissipation performance.

[0042] like Figure 6 As shown, the length of the threaded steel bar 9 is slightly less than the sum of the length of the precast beam and the width of the precast column. Most of it is embedded in the precast concrete beam 2, and a small part is detachably fixedly connected with the hexagonal nut 10. After the threaded steel bar 9 is detachably connected with the hexagonal nut 10, it passes through the threaded steel hole 2 82 of the steel block 8 and is fixedly inserted into the threaded steel hole 12 in the precast concrete column 1. The threaded steel bar that passes through the beam and column can effectively exert the integrity and safety of the structure.

[0043] For example, the specific construction method of the prefabricated concrete frame beam-column dry connection node is as follows:

[0044] The high ductility steel rod 4 is fixedly connected to the joint 5 and buried in the precast concrete column 1 together with the pad 3;

[0045] The threaded steel bar 9 is connected with the hexagonal nut 10 and buried in the precast concrete beam 2. The precast concrete column 1 and the precast concrete beam 2 are prefabricated in the factory. During installation, the four holes of the steel block 8 are aligned with the four holes of the precast concrete column 1, so that two bolts 6 pass through the corresponding bolt holes of the steel block 8 and are screwed into the high ductility steel rod 4 embedded in the precast concrete column 1;

[0046] After the bolts 6 have fixed the two steel blocks 8 in the upper and lower node areas, the exposed threaded steel 9 on the precast concrete beam 2 is aligned with the threaded steel holes of the steel blocks 8 in the upper and lower node areas, slowly inserted, and embedded into the threaded steel hole 12 in the precast concrete column 1 to form a precast concrete frame beam-column dry node.

[0047] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An assembled concrete frame beam-column dry connection node, comprising a precast concrete column (1) and a precast concrete beam (2), characterized in that: The upper groove area and the lower groove area at the end where the precast concrete beam (2) is connected to the precast concrete column (1) are node areas, and also include a steel block (8) whose back side is detachably fixedly connected to the connection side of the precast concrete column (1). A plurality of threaded steel bars (9) are pre-embedded in the precast concrete beam (2), and the portion of the threaded steel bars (9) that passes through the precast concrete beam (2) is detachably fixedly connected to the precast concrete column (1) via the steel block (8).

2. The assembled concrete frame beam-column dry connection node according to claim 1 is characterized in that: A bolt hole (11) and a threaded steel hole (12) are provided on one side of the precast concrete column (1) where the precast concrete beam (2) is connected, and the two threaded steel holes (12) are located between the two bolt holes (11).

3. The assembled concrete frame beam-column dry connection node according to claim 2 is characterized in that: A high-ductility steel rod (4) and a joint (5) are pre-buried in the precast concrete column (1) along the extension direction of the bolt hole 1 (11); the high-ductility steel rod (4) and the joint (5) are detachably fixedly connected.

4. The assembled concrete frame beam-column dry connection node according to claim 3 is characterized in that: A pad (3) is provided on one side of the high-ductility steel rod (4) close to the surface of the precast concrete column (1); the pad (3) is used to adjust the parallelism of the high-ductility steel rod (4) so ​​that it is aligned with the second bolt hole (81) on the steel block (8); and the pad (3) is pre-buried in the precast concrete column (1).

5. The assembled concrete frame beam-column dry connection node according to claim 4 is characterized in that: The steel block (8) is provided with two bolt holes (81) and two threaded steel holes (82) through it, and the two threaded steel holes (82) are located between the two bolt holes (81); the two bolt holes (81) correspond one-to-one with the two bolt holes (11), and the two threaded steel holes (82) correspond one-to-one with the two threaded steel holes (12).

6. The assembled concrete frame beam-column dry connection node according to claim 5, characterized in that: The steel block (8) cooperates with the pre-buried pad block (3), high-ductility steel rod (4) and joint (5) in the precast concrete column (1) through bolts (6) and gaskets (7), so that the steel block (8) is detachably fixedly connected to the precast concrete column (1).

7. The assembled concrete frame beam-column dry connection node according to claim 1, characterized in that: Two threaded steel bars (9) are symmetrically embedded in the precast concrete beam (2) in the upper and lower parts. The two threaded steel bars (9) extend out of the precast concrete beam (2) and are detachably fixedly connected with hexagonal nuts (10) in the upper groove area and the lower groove area, respectively.

8. The assembled concrete frame beam-column dry connection node according to claim 7, characterized in that: The portion of each threaded steel bar (9) that passes through the hexagonal nut (10) passes through the second threaded steel hole (82) on the steel block (8) and is fixedly inserted into the first threaded steel hole (12) of the precast concrete column (1), and the back side of the hexagonal nut (10) is connected to the steel block (8).

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