CN114000585B - A prefabricated concrete beam-column connection node and connection method - Google Patents

Abstract

The invention discloses a precast concrete beam column connecting node and a connecting method, which comprise two precast concrete columns, two precast concrete beams, a plurality of steel bar extrusion sleeves, a central firmware and two auxiliary firmwares, wherein the two precast concrete columns are arranged in parallel; the central firmware comprises a cross barrel and a cross plate; two ends of the cross cylinder are respectively and fixedly connected with one end of each of the two precast concrete columns; the cross plate is inserted in the cross cylinder; the auxiliary fixing piece comprises I-shaped steel and two connecting cover plates; the I-shaped steel and the precast concrete beam are integrally formed, and two ends of the I-shaped steel respectively extend out of two end faces of the precast concrete beam; one end of the I-shaped steel is fixedly connected with the cross plate through two connecting cover plates; the two precast concrete columns are fixedly connected through the crossed cylinders and the plurality of steel bar extrusion sleeves respectively. The invention can improve the tensile strength of the precast concrete beam column connecting node and enhance the shock resistance of the building applying the invention.

Description

A prefabricated concrete beam-column connection node and connection method

technical field

The invention relates to the field of concrete installation, in particular to a prefabricated concrete beam-column connection node and a connection method.

Background technique

The connection joints of prefabricated structures that have been studied can be roughly divided into prestressed splicing joints, post-cast integral joints, bolted joints and welded joints. The prestressed splicing joint is to pass the prestressed tendons through the reserved holes of the concrete beams and columns, then stretch the prestressed tendons and anchor them on the sides of the prefabricated beams and columns, and finally pour mortar into the reserved holes The way precast beams and columns are joined together. The post-cast integral connection is a connection method in which the steel bars in the prefabricated beam-column are connected after the beam-column is installed in place, and then a concrete strip is poured with concrete at the beam-column joint. Welding connection is to achieve the purpose of connection by welding the connectors embedded in the components. Bolt connection is a method of pre-embedding steel plates and bolt holes in prefabricated beams and columns, and then connecting the beams and columns with bolts. In this way, the prefabricated frame can quickly reach a certain strength. Bolted connections have the advantages of strong adaptability, less environmental impact, and convenient and quick construction, so they are widely used. In the current study of prefabricated beam-to-column joints, bolt connection is the focus of many scholars' research, so various bolt connection forms emerge in endlessly.

The connection and positioning of vertical components requires high requirements. After the connection, more temporary supports need to be set up, and the construction efficiency is not high; the longitudinal reinforcement of the column is connected by grouting sleeve, the construction process is complicated, and the construction quality inspection is inconvenient. The construction quality should not be guaranteed, the sleeve connection quality inspection is inconvenient, the steel bars in the core area of the joint are crowded, and the construction is difficult.

Contents of the invention

The object of the present invention is to provide a prefabricated concrete beam-column connection node and connection method to solve the above-mentioned problems in the prior art, improve the tensile strength of the present invention, and enhance the earthquake resistance of the building applying the present invention.

To achieve the above object, the present invention provides the following scheme:

The invention provides a prefabricated concrete beam-column connection node, comprising two prefabricated concrete columns, two prefabricated concrete beams, several steel bar extruding sleeves, a central fixture and two auxiliary fixtures;

The central fixture includes a cross tube and a cross plate; both ends of the cross tube are respectively fixedly connected to one end of two precast concrete columns; the cross plate is inserted into the cross tube;

The auxiliary fixture includes an I-beam and two connecting cover plates; the I-beam is integrally formed with the precast concrete beam, and the two ends of the I-beam protrude from the two ends of the precast concrete beam respectively; One end of the I-beam is fixedly connected to the cross plate through the two connecting cover plates;

The two prefabricated concrete columns are fixedly connected through the cross cylinder and several steel bar extrusion sleeves respectively.

Preferably, the cross cylinder includes two steel pipes; the outer diameter of one of the steel pipes is equal to the inner diameter of the other steel pipe; one end of the two steel pipes is fixedly connected to one end of the two prefabricated concrete columns, and the steel pipe The other end face is fixed with four fixed pieces at equal intervals in the circumferential direction; a separation groove is formed between two adjacent fixed pieces; the cross plate is arranged in the separation groove; the fixed pieces of the two steel pipes Correspondingly arranged; wherein the outer surface of the fixed piece on the steel pipe with a small diameter is attached to the inner surface of the fixed piece on the steel pipe with a large diameter.

Preferably, the two fixed pieces that are attached to each other are screwed together.

Preferably, the cross board includes two gusset boards; slots are opened in the middle of the two gusset boards; the two gusset boards are plugged into a cross shape through the slots; the gusset boards are inserted into the in the separation slot.

Preferably, the thickness of the gusset plate is equal to the width of the separation groove.

A connection method for prefabricated concrete beam-column connection nodes, comprising the following steps:

preparing connecting parts; integrally forming the precast concrete beam with the concrete and the I-beam, and integrally forming the precast concrete column with the concrete and the steel pipe;

Connecting the concrete columns: fixing the two precast concrete columns through the steel pipes; using the steel bar extrusion sleeve to respectively fix and connect the ends of the steel bars protruding from the two precast concrete columns;

Connecting concrete beams: using the auxiliary fasteners to fix the prefabricated concrete beams and the cross cylinder together;

Preferably, the concrete is RPC concrete.

Preferably, in the step of preparing the connecting parts, the steel frame is matched with the I-beam to form a skeleton, and then the concrete is cast to prepare a precast concrete beam; one end of the steel pipe is fastened to the steel frame , and then casting the concrete to prepare the precast concrete column.

The invention discloses the following technical effects:

In the present invention, the pre-embedded steel pipes and joint plates at the upper and lower columns are positioned, and the connection between the columns is convenient for construction and positioning, and the stability is high. Through the steel sleeve extrusion connection and sleeve connection, the construction process is simple and the quality inspection is convenient. The prefabricated beams and slabs are laminated components, and the pre-embedded I-beams at the end of the prefabricated beams are connected to the joint plate in the core area of the joint through high-strength bolts. The construction process does not require support, and the construction is convenient and fast. The core area of the joint and the beam end are post-cast with high strength. , high-toughness active powder concrete forms a whole, can make full use of RPC concrete, that is, the ultra-high strength and toughness of active powder concrete, reduce the amount of separate stirrups in the core area or do not use separate stirrups, and solve the congestion of steel bars in the core area of the node. For the problem of difficult construction, the position of the plastic hinge at the end of the beam can be moved outward by rationally setting the additional longitudinal reinforcement that runs through the joint, so as to ensure that the bending failure of the beam end first occurs under earthquake action, and improve the ductility and energy dissipation capacity of the structure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic diagram of the structure of the present invention in side view.

Fig. 2 is a schematic diagram of the assembly structure of the cross cylinder and the cross plate of the present invention.

Figure 3 is a schematic side view of the prefabricated concrete beam after assembly.

Fig. 4 is a schematic diagram of the front structure of the precast concrete beam after assembly.

Figure 5 is a schematic diagram of the gusset plate structure.

Fig. 6 is a schematic diagram of the side view structure of the fifth embodiment.

Fig. 7 is a partial structural schematic diagram of the fifth embodiment.

Fig. 8 is a schematic diagram of the side view structure of the cross plate in the second embodiment.

Fig. 9 is a side view structural diagram of Embodiments 2 and 4.

Among them, 1. Precast concrete columns; 2. Precast concrete beams; 3. Steel extrusion sleeves; 4. Separate stirrups; 5. Connecting cover plates; 6. Node plates; 8. I-beams; 9. Steel pipes; 10. Fixed piece; 11. Separation groove; 12. Auxiliary plate; 13. Slot; 14. Nitrogen spring; 15. Fixed block; 16. Limiting tongue; 17 Pressure gauge; 18. Feeding hole; 19. Long bolt.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one:

Referring to Figures 1-5, a precast concrete beam-column connection node includes two precast concrete columns 1, two precast concrete beams 2, several steel bar extrusion sleeves 3, a central fixture and two auxiliary fixtures;

The central fixture includes a cross tube and a cross plate; both ends of the cross tube are fixedly connected to one end of two prefabricated concrete columns 1 respectively; the cross plate is inserted in the cross tube;

Auxiliary fixtures include I-beam 8 and two connecting cover plates 5; the sides of I-beam 8 are fixed with reinforcement frames, which are integrally formed with precast concrete beam 2, and the two ends of I-beam 8 protrude from precast concrete beam 2 respectively. Both ends form a fixed end; one end of the I-beam 8 is fixedly connected to the cross plate through two connecting cover plates 5 with screws;

Further, the steel bar frame is a cage-shaped structural member fixedly connected by a plurality of steel bars, which is a prior art and will not be repeated here.

Two prefabricated concrete columns 1 are fixedly connected through cross cylinders and several steel bar extrusion sleeves 3 respectively.

Further, the prefabricated concrete column 1 is integrally formed by using the steel bar frame and the cross cylinder fixed above it, and several steel bars, and the cross cylinder and the steel bars all protrude from one end face of the precast concrete column; the corresponding two precast concrete columns 1 One end of the steel bar is fixedly connected by the steel bar extruding sleeve 3.

Further, separate stirrups 4 are fixed on the peripheral sides of several steel bars exposing the end faces of the precast concrete columns 1, which can provide lateral support for the mutual connection of several steel bars.

Further, in order to facilitate a clear understanding of the technical structure of the present invention, the flanges at both ends of the I-beam 8 in Figures 2-4 and 6-7 are shown in the accompanying drawings.

To further optimize the scheme, the cross cylinder includes two steel pipes 9; the outer diameter of one of the steel pipes 9 is equal to the inner diameter of the other steel pipe 9; one end of the two steel pipes 9 corresponds to and fixedly connects with the ends of two prefabricated concrete columns 1 respectively, and the two Two prefabricated concrete columns 1 are respectively fixedly connected through two steel pipes 9; the other end faces of the steel pipes 9 are fixed with four fixed pieces 10 along the circumferential direction at equal intervals; a separation groove 11 is formed between two adjacent fixed pieces 10;

Further, the fixing pieces 10 fixed at one end of the two steel pipes 9 are arranged in one-to-one correspondence; the separation grooves 11 formed by the fixing pieces 10 fixed at one end of the two steel pipes 9 can communicate with each other, which is convenient for cross-board insertion.

The separation groove 11 is compatible with the cross plate, and the cross plate is arranged in the separation groove 11; the fixing pieces 10 of the two steel pipes 9 are arranged correspondingly; The inner surface of the fixed sheet 10 on the top is attached.

Further, one end of the fixed piece 10 on the small-diameter steel pipe 9 is respectively arranged in the inner cavity of the steel pipe 9, and the outer surface of the fixed piece 10 is attached to the inner wall of the steel pipe 9, and the fixed piece 10 inside it is restricted by the steel pipe 9. bit, improving the tensile strength of the cross cylinder.

To further optimize the scheme, the two fixed pieces 10 that fit together are screwed together, and high-strength bolts are used to connect the two fixed pieces 10 that are fitted together, so that the fixed pieces 10 that fit together are connected into a whole, and then all The steel pipes 9 and the fixing pieces 10 are connected as a whole, which further improves the tensile strength of the cross cylinder.

To further optimize the scheme, the cross board includes two gusset plates 6; slots 13 are provided in the middle of the two gusset plates 6; the two gusset plates 6 are plugged into a cross shape through the slots 13; , through the interlocking of the two gusset plates 6 through the slots 13, the four-way connection of the connection points of the concrete beams and columns is realized.

Further, the middle part of one side of the gusset plate 6 far away from the slot 13 is fixedly connected with an auxiliary plate 12; the two opposite sides of the auxiliary plate 12 are respectively adapted and slidingly contacted with the inner wall of the steel pipe 9, and the auxiliary plate 12 is used to realize the alignment of the steel pipe. 9's auxiliary support further improves the tensile strength of the cross cylinder.

In a further optimized solution, the thickness of the gusset plate 6 is equal to the width of the separation groove 11 .

A connection method for prefabricated concrete beam-column connection nodes, comprising the following steps:

Prepare the connecting parts; integrally form the concrete and the I-beam 8 into the precast concrete beam 2, and integrally form the concrete and the steel pipe 9 into the precast concrete column 1;

Connecting the concrete columns: two prefabricated concrete columns 1 are fixedly connected through the steel pipe 9; the ends of the steel bars protruding from the two prefabricated concrete columns 1 are respectively fixedly connected by using the steel bar extrusion sleeve 3;

Connecting concrete beams: the prefabricated concrete beams 2 and the cross tubes are fixed together with auxiliary fixtures; the two ends of the I-beam 8 are formed with fixed ends, and the fixed ends of the I-beam 8 and one end of the gusset plate 6 pass through two connecting covers The plates 5 are screwed together, and the fixed end of the I-beam 8 and the gusset plate 6 are respectively arranged between the two connecting cover plates 5, and the I-beam 8, the gusset plate 6 and the connecting cover plate 5 are realized by using high-strength bolts. The overall fastening improves the connection strength between the precast concrete column 1 and the precast concrete beam 2.

To further optimize the scheme, the concrete is RPC concrete.

To further optimize the scheme, in the step of preparing the connecting parts, the steel frame is matched with the I-beam 8 to form a skeleton, and then the concrete is cast to prepare the prefabricated concrete beam 2; one end of the steel pipe 9 is fastened to the steel frame, and then the concrete is cast to prepare the precast concrete column 1.

Embodiment two:

As shown in Figures 8-9, the difference between the fixed piece 10 and the cross plate of this embodiment and the first embodiment is that not only the two fixed pieces 10 that are attached to each other are screwed together, but also the space between the steel pipes 9 that are affixed The four fixed pieces 10 provided are fastened together by a long bolt 19 . The long bolts 19 pass through the two gusset plates 6 and are fixedly connected with the two gusset plates 6 , preferably by welding, which can improve the overall strength.

The two gusset plates 6 are inserted into each other through the slots 13. After being plugged in place, the two gusset plates 6 are also welded along the slots 13, so that the two gusset plates 6 become a whole, and the resistance of the two gusset plates 6 is improved. tensile strength.

Embodiment three:

A connection method of a prefabricated concrete beam-column connection node in this embodiment also includes the following steps:

Grouting: After all the structures in Embodiment 1 are connected, concrete is poured on the part between the opposite sides of the two prefabricated concrete columns 1, the cross cylinder and the cross plate, and at the same time the two gusset plates 6 and the I-beam 8 The fixed ends protrude from the cast concrete block. By casting concrete, the two prefabricated concrete columns 1, the cross tube and the cross plate are connected into a whole, and the cross tube and the cross plate are used as the skeleton, and the concrete is used as the frame. Filling improves the connection strength and tensile strength of the connection points of concrete beams and columns.

Embodiment four

As shown in Figure 9, in this embodiment, on the basis of the third embodiment, a number of feeding holes 18 are opened on the side wall of the fixed piece 10, so as to improve the fluidity of the concrete during grouting, make the concrete filling more sufficient, and make the cast concrete Block strength is higher.

Embodiment five

Referring to Figures 6-7, the difference between this embodiment and the first embodiment is that the connection cover plate 5 is canceled; and one end of the I-beam 8 is rotationally connected with the gusset plate 6; one side of the gusset plate 6 is provided with a nitrogen spring 14. The nitrogen spring 14 is fixedly connected to one side of the gusset plate 6 through the fixed block 15, and the telescopic rod of the nitrogen gas spring 14 is fixedly connected to the limit tongue 16; the limit tongue 16 runs through one side of the gusset plate 6 and extends out of the gusset plate 6 On the other side; the limiting tongue 16 is a cubic structure, and its bottom surface is set at a chamfered angle; the limiting tongue 16 is slidably connected with the gusset plate 6;

One end top surface of I-beam 8 is arranged on below the slope of limit tongue 16, and matches with the slope of limit tongue 16; All nitrogen gas springs 14 are all connected in series by gas line (not shown in accompanying drawing); And gas A pressure gauge is connected in series on the line;

The technical effect of this embodiment is that the concrete block cast through the connection point is used as a fixed node, and the I-beam 8 fixed on the precast concrete beam 2 realizes the limit of the precast concrete beam 2 through the limit tongue 16, and can Realize that when the external force is applied to the building to which the present invention is applied, the present invention can utilize the connection of the I-beam 8 and the gusset plate 6 to improve the connection strength of the connection point of the concrete beam and column; at the same time, when the external force exceeds the concrete beam and column When the connection strength of the connection point is high, the I-beam 8 can rotate with the gusset plate 6 to reduce the rigid damage caused by the rigid connection, and use the nitrogen spring 14 fixed on the gusset plate 6 to realize the shaking speed of the I-beam 8 buffer, and in order to prevent the damage of the nitrogen gas spring 14 and avoid the failure of the overall device of the present invention caused by the damage of a single nitrogen gas spring 14, all the nitrogen gas springs 14 are connected in series, and the pressure gauge 17 is used to monitor the whole device situation, avoiding the present invention invalidated.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientations or positional relationships indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or It should not be construed as limiting the invention by implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation.

The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (6)

1. A precast concrete beam column connecting node is characterized by comprising two precast concrete columns (1), two precast concrete beams (2), a plurality of steel bar extrusion sleeves (3), a center firmware and two auxiliary firmwares;

the central fixture comprises a cross barrel and a cross plate; two ends of the cross cylinder are respectively and fixedly connected with one ends of the two precast concrete columns (1); the cross plate is inserted in the cross cylinder;

the auxiliary fixing piece comprises an I-shaped steel (8) and two connecting cover plates (5); the I-shaped steel (8) and the precast concrete beam (2) are integrally formed, and two ends of the I-shaped steel (8) respectively extend out of two end faces of the precast concrete beam (2); one end of the I-shaped steel (8) is fixedly connected with the cross plate through the two connecting cover plates (5);

the two precast concrete columns (1) are fixedly connected through the cross cylinder and the plurality of steel bar extrusion sleeves (3) respectively;

the cross barrel comprises two steel tubes (9); the outer diameter of one steel pipe (9) is equal to the inner diameter of the other steel pipe (9); one ends of the two steel pipes (9) are respectively and fixedly connected with one ends of the two precast concrete columns (1), and the end face of the other end of each steel pipe (9) is fixedly connected with four fixing pieces (10) at equal intervals along the circumferential direction; a separation groove (11) is formed between two adjacent fixing sheets (10); the cross plate is arranged in the separation groove (11); the fixing pieces (10) of the two steel pipes (9) are arranged correspondingly; wherein the outer side surface of the fixing piece (10) on the small-diameter steel pipe (9) is attached to the inner side surface of the fixing piece (10) on the large-diameter steel pipe (9);

the cross plate comprises two gusset plates (6); the middle parts of the two gusset plates (6) are provided with slots (13); the two gusset plates (6) are inserted into the slots (13) in a cross shape; the gusset plates (6) are inserted into the separation grooves (11);

four that the interval of rigid coupling set up on steel pipe (9) stationary blade (10) are in the same place through a stay bolt (19) rigid coupling, stay bolt (19) run through two gusset plate (6) and with two gusset plate (6) fixed connection, two gusset plate (6) are passed through slot (13) are pegged graft each other.

2. A precast concrete beam-column connection node according to claim 1, wherein: the two mutually attached fixing pieces (10) are in threaded connection.

3. A precast concrete beam column connection node according to claim 1, wherein: the thickness of the gusset plate (6) is equal to the width of the separation groove (11).

4. A method of connecting a precast concrete beam-column connection node according to any one of claims 1 to 3, wherein: the method comprises the following steps:

preparing a connecting part; integrally forming the precast concrete beam (2) by using concrete and the I-shaped steel (8), and integrally forming the precast concrete column (1) by using the concrete and the steel pipe (9);

connecting the concrete columns: fixedly connecting the two precast concrete columns (1) through the steel pipes (9); the ends of the steel bars extending out of the two precast concrete columns (1) are fixedly connected by utilizing the steel bar extrusion sleeves (3);

connecting a concrete beam: and fixedly connecting the precast concrete beam (2) with the cross barrel by using the auxiliary firmware.

5. The method for connecting a precast concrete beam-column connection node according to claim 4, wherein: the concrete is RPC concrete.

6. The method for connecting a precast concrete beam-column connection node according to claim 4, wherein: in the step of preparing the connecting part, a framework is formed by matching a reinforcing steel frame and the I-shaped steel (8), and then the precast concrete beam (2) is prepared by casting the concrete; and fixedly connecting one end of the steel pipe (9) to the steel bar frame, and then casting the concrete to prepare the precast concrete column (1).

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