Connecting joint of prefabricated column and transfer beam and construction method of connecting joint

Abstract

The connecting node is arranged between a precast pile and the transfer beam, and comprises an upper node, a lower node, an upper node and a lower node, wherein the upper node is fixed at the bottom of the precast pile; the lower node is pre-buried in the transfer beam and extends out of the top of the transfer beam, and the bottom of the upper node is fixedly connected with the top of the lower node; and one end of the connecting piece is fixed on the surface of the upper node, and the other end of the connecting piece is fixed on the surface of the lower node. The upper nodes are arranged at the bottoms of the precast piles, the lower nodes are arranged at the tops of the transfer beams, the upper nodes and the lower nodes are fixedly connected to achieve connection between the precast piles and the transfer beams, and the connecting strength between the upper nodes and the lower nodes is further enhanced by arranging the connecting pieces; the double connection ensures that the joint has enough rigidity and can effectively disperse stress at the same time, so that the arrangement of an inclined strut can be omitted, and the construction space is saved.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and particularly to a connection node between a precast column and a transfer beam and a construction method thereof. Background Art

[0002] With the vigorous promotion of prefabricated buildings, precast columns, as key vertical load-bearing members, are widely used. In most building designs, the functional partitions of the basement and the above-ground part are different, and transfer beams are often set up to adapt to different structural systems and achieve load transfer and space conversion. In the prior art, sleeve grouting connection is adopted between precast piles and transfer beams. In order to ensure the structural stability between precast piles and transfer beams, additional diagonal braces need to be set, resulting in a large amount of construction space being occupied and difficult construction in narrow spaces. Summary of the Invention

[0003] A connection node between a precast column and a transfer beam of the present invention is provided with a lower node at the top of the transfer beam, and the upper node and the lower node are fixedly connected to achieve the connection between the precast pile and the transfer beam. By setting connecting members, the connection strength between the upper node and the lower node is further strengthened. While the double connection ensures that the node has sufficient stiffness, it can effectively disperse stress. Therefore, the setting of diagonal braces can be omitted, saving construction space.

[0004] A connection node between a precast column and a transfer beam of the present invention is arranged between the precast pile and the transfer beam, and includes: an upper node fixed to the bottom of the precast pile; a lower node buried in the transfer beam and having its top extending out of the top of the transfer beam, and the bottom of the upper node is fixedly connected to the top of the lower node;

[0005] At least one connecting member, one end of the connecting member is fixed to the surface of the upper node, and the other end is fixed to the surface of the lower node.

[0006] A further improvement of the present invention is that the surfaces at the connection between the upper node and the lower node are aligned to form a connection plane. The connecting member includes a connecting plate, and through holes are respectively formed at both ends of the connecting plate. Bolts are respectively inserted into each through hole. The upper node is provided with a first screw hole on the connection plane, and the lower node is provided with a second screw hole on the connection plane. The distance between the first screw hole and the second screw hole is equal to the distance between the two through holes; wherein, one bolt is screwed into the first screw hole, and the other bolt is screwed into the second screw hole.

[0007] A further improvement of the present invention is that the transfer beam is a reinforced concrete structure, and a steel reinforcement cage is buried inside the transfer beam.

[0008] The part of the lower node embedded in the transfer beam is inserted into the steel reinforcement cage. The lower node is provided with a connecting surface extending outward in the horizontal direction, and the top reinforcement of the steel reinforcement cage is fixedly connected to the connecting surface.

[0009] A further improvement of the present invention is that the part of the lower node embedded in the transfer beam is provided with a plurality of second shear studs for improving the connection strength between the lower node and the transfer beam.

[0010] A further improvement of the present invention is that the upper node and the lower node are fixedly connected by welding. Welding grooves are provided on the upper node / lower node at the connection with the lower node / upper node.

[0011] A further improvement of the present invention further includes a pre-embedded part in the precast pile. The bottom of the pre-embedded part extends downward from the bottom of the precast pile and is fixed to the top of the upper node. The surface of the pre-embedded part is provided with a plurality of first shear studs for enhancing the connection strength between the pre-embedded part and the precast pile.

[0012] A construction method for a connection node between a precast column and a transfer beam of the present invention includes the following steps:

[0013] S1. Fix the upper node at the bottom of the precast pile, fix the lower node at the bottom of the upper node, provide a connecting member, and fix one end of the connecting member to the upper node and the other end to the lower node.

[0014] S2. Construct the transfer beam, and when constructing the transfer beam, embed the bottom of the lower node into the transfer beam.

[0015] A further improvement of the present invention is that the transfer beam is a concrete structure with a steel reinforcement cage embedded inside. The lower node is provided with a connecting surface extending outward in the horizontal direction. When constructing the transfer beam, it includes the following steps: Erect the steel reinforcement cage outside the lower node, fixedly connect part of the top reinforcement of the steel reinforcement cage to the connecting surface, and after the erection of the steel reinforcement cage is completed, formwork and pour it to form the transfer beam.

[0016] By setting the upper node at the bottom of the precast pile and the lower node at the top of the transfer beam, and fixedly connecting the upper node and the lower node to achieve the connection between the precast pile and the transfer beam. By setting the connecting member, the connection strength between the upper node and the lower node is further strengthened. While the double connection ensures that the node has sufficient stiffness, it can effectively disperse the stress. Therefore, the setting of the diagonal brace can be omitted, saving the construction space. Description of the Drawings

[0017] Figure 1Schematic diagram of the upper node of the present invention;

[0018] Figure 2 Schematic diagram of the lower node of the present invention;

[0019] Figure 3 Schematic diagram of the precast column and the transfer beam of the present invention when not connected;

[0020] Figure 4 Schematic diagram of the precast column and the transfer beam of the present invention when connected;

[0021] Figure 5 Cross-sectional view at A-A when there is a secondary beam on one side of the transfer beam of the present invention;

[0022] Figure 6 Cross-sectional view at A-A when there are secondary beams on both sides of the transfer beam of the present invention;

[0023] In the figure: 1. Upper node; 11. Embedded part; 111. First shear stud; 12. First screw hole; 2. Lower node; 21. I-beam; 212. Second shear stud; 22. Second screw hole; 3. Precast pile; 4. Transfer beam; 41. Top reinforcement; 42. Stirrup; 43. Corner top reinforcement; 51. Bolt; 52. Connection plate; 6. Secondary beam; 7. Partition; 8. Welding groove. Detailed implementation manner

[0024] As Figures 1 to 6 shown, a connection node between a precast column and a transfer beam is provided between the precast pile 3 and the transfer beam 4, and includes: an upper node 1 fixed to the bottom of the precast pile 3; a lower node 2 embedded in the transfer beam 4 and extending out of the top of the transfer beam 4, and the bottom of the upper node 1 is fixedly connected to the top of the lower node 2; at least one connecting member, one end of the connecting member is fixed to the surface of the upper node 1, and the other end is fixed to the surface of the lower node 2. In the present invention, the upper node 1 and the lower node 2 are fixedly connected to achieve the connection between the precast pile 3 and the transfer beam 4. By setting the connecting member, the connection strength between the upper node 1 and the lower node 2 is further strengthened. While the double connection ensures that the node has sufficient stiffness, it can effectively disperse stress. Therefore, the setting of the diagonal brace can be omitted, saving construction space.

[0025] As Figures 1 to 2 shown, the upper node 1 is a first connecting column, the lower node 2 is a second connecting column, the cross-sections of the first connecting column and the second connecting column are the same, and the first connecting column and the second connecting column are fixed in the vertical direction and the cross-sections are aligned.

[0026] As Figure 4As shown in the figure, the connecting member includes: a connecting plate 52, with a perforation provided at each of the two ends of the connecting plate 52, and a bolt 51 is inserted through each perforation. A first threaded hole 12 is provided on the surface of the first connecting column, and a second threaded hole 22 is provided on the surface of the second connecting column. The distance between the first threaded hole 12 and the second threaded hole 22 is equal to the distance between the two perforations; one of the bolts 51 is threadedly connected to the first threaded hole, and the other bolt 51 is threadedly connected to the second threaded hole. Through the connection of the bolts 51, the installation of the connecting member is convenient and detachable.

[0027] Preferably, as Figure 4 shown in the figure, in this embodiment, in four directions at the connection of the upper node 1 and the lower node 2, two connecting members are provided in each direction, and a total of eight connecting members are provided. By providing the connecting members, the connection strength between the first connecting column and the second connecting column can be further enhanced.

[0028] As Figures 3 to 4 shown in the figure, the transfer beam 4 is a post-cast concrete structure. A transfer beam reinforcement cage is embedded inside the transfer beam 4. The part of the lower node 2 embedded in the transfer beam 4 is inserted into the reinforcement cage. The lower node 2 is provided with a connecting surface extending horizontally outwards, and the top reinforcement 41 of the reinforcement cage is fixedly connected to the connecting surface.

[0029] By providing the connection between the connecting surface and the top reinforcement 41, the contact area between the top reinforcement 41 and the lower node is increased, and the connection stability is improved.

[0030] As Figures 3 to 4 shown in the figure, in this embodiment, the lower node 2 is a cross-shaped steel column; the cross-shaped steel column includes a pair of webs intersecting in a cross shape and four vertical plates perpendicular to the corresponding webs respectively fixed at the ends of the four webs of the cross shape; the transfer beam reinforcement cage includes a top reinforcement 41, a bottom reinforcement, and stirrups 42 hoop-mounted outside the top reinforcement 41 and the bottom reinforcement; one of the webs of the cross-shaped steel column is arranged along the axial direction of the transfer beam 4, and an I-beam 21 is respectively fixed on the vertical plates at both ends of the web arranged along the axial direction of the transfer beam 4. The upper flange plate and the lower flange plate of the I-beam 21 are both arranged horizontally, and the upper flange plate is the connecting surface in this embodiment. The end of the top reinforcement 41 is fixed on the upper surface of the upper flange plate, and the top reinforcement 41 and the bottom reinforcement extend towards both sides along the axial direction of the transfer beam 4.

[0031] Preferably, in this embodiment, the upper node 1 is also a cross-shaped steel column, and the upper node 1 and the lower node 2 have the same specifications and are aligned and connected. One end of the connecting member is fixed on the flange plate of the upper node 1, and the other end is fixed on the flange plate of the lower node 2. Two connecting members are fixed on each flange plate.

[0032] In another embodiment, as Figure 5As shown, a secondary beam 6 perpendicular to the transfer beam 4 is also constructed on one side of the transfer beam 4. The secondary beam 6 is also a post-cast concrete structure, and a steel reinforcement cage is embedded therein, including top reinforcement 41, bottom reinforcement, and stirrups 42 hoop-mounted outside the top reinforcement 41 and the bottom reinforcement. A part of the lower joint 2 is embedded in the steel reinforcement cage. At this time, an I-beam 21 is fixed on the flange plate at one end of the web arranged along the axial direction of the transfer beam 4. The upper flange plate and the lower flange plate of the I-beam 21 are both arranged horizontally. The end of the top reinforcement 41 is fixed on the upper surface of the upper flange plate, and the top reinforcement 41 and the bottom reinforcement extend to both sides along the axial direction of the transfer beam 4.

[0033] Preferably, the top reinforcement 41 in this embodiment is double-sided welded to the upper surface of the flange plate of the I-beam 21.

[0034] In another embodiment, as Figure 6 shown, secondary beams 6 are constructed on both sides of the transfer beam 4. At this time, an I-beam 21 is fixed on the flange plates at both ends of the web arranged along the axial direction of the transfer beam 4. The end of the top reinforcement 41 is fixed on the upper surface of the upper flange plate, and the bottom reinforcement is fixed to the stirrups 42. The top reinforcement 41 and the bottom reinforcement extend to both sides along the axial direction of the transfer beam 4.

[0035] As Figures 3 to 6 shown, it further includes top corner reinforcement 43. The top corner reinforcement 43 is located on both sides of the lower joint 2. The top corner reinforcement 43 penetrates from one end of the transfer beam 4 to the other end without contacting the lower joint 2. By providing the top corner reinforcement 43, the lower joint 2 is completely embedded in the transfer beam 4.

[0036] As Figures 3 to 6 shown, the second cross-shaped steel includes one flange plate, and partitions 7 are connected between two adjacent flange plates among the four flange plates.

[0037] As Figure 2 shown, preferably, a plurality of second shear studs 212 are arranged in the part of the lower joint 2 embedded in the transfer beam 4. By providing the second shear studs 212, the connection between the part of the lower joint 2 embedded in the transfer beam 4 and the transfer beam 4 is made more stable, enhancing the strength of the structure.

[0038] As Figure 4 shown, preferably, the upper joint 1 and the lower joint 2 are fixedly welded. A welding groove 8 is opened at the joint of the upper joint 1 / the lower joint 2 located at the connection with the lower joint 2 / the upper joint 1. In this embodiment, the welding groove 8 is opened at the bottom of the upper joint 1. By providing the welding groove 8, the welding construction between the upper joint 1 and the lower joint 2 is made more convenient.

[0039] As Figure 1As shown, preferably, it also includes an embedded part 11 embedded in the precast pile 3, the bottom of the embedded part 11 extends downward from the bottom of the precast pile 3 and is fixed to the top of the upper node 1, and a plurality of first shear nails 111 are arranged on the surface of the embedded part 11. By providing the first shear nails 111, the connection between the embedded part 11 and the precast pile 3 is made more stable, thereby enhancing the strength of the structure.

[0040] The present invention comprises the following steps during construction:

[0041] S1, fixing the upper node 1 at the bottom of the precast pile 3, and fixing the lower node 2 at the bottom of the upper node 1, providing a connecting piece, and fixing one end of the connecting piece to the upper node 1, and the other end to the lower node 2;

[0042] S2. Construct the transfer beam 4. When constructing the transfer beam 4, embed the bottom of the lower node 2 in the transfer beam 4.

[0043] Preferably, in this embodiment, the transfer beam 4 is a concrete structure with a steel cage buried inside, and a connecting surface extending outward in a horizontal direction is provided on the lower node 2. When constructing the transfer beam 4, the following steps are included: erecting a steel cage outside the lower node 2, fixing part of the top reinforcement of the steel cage to the connecting surface, and after the steel cage is erected, it is formworked and cast to form the transfer beam 4.

[0044] Preferably, in the early stage of construction, in order to ensure the accuracy of construction, BIM technology is used to perform virtual modeling and collision checks on the prefabricated columns 3 and transfer beams 4, so as to discover and adjust design and construction deviations in advance; during on-site construction, with the help of high-precision total stations and laser levels, the plane position and elevation of the lower node 2 are strictly controlled during the pre-embedded stage, and before the prefabricated columns 3 leave the factory, the dimensional accuracy of the column base is verified by a three-coordinate measuring instrument, and real-time dynamic monitoring and adjustment are carried out during hoisting to control the installation error within the millimeter level.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection node between a prefabricated column and a transfer beam, characterized in that: It is arranged between the precast pile and the transfer beam, and comprises: an upper node fixed to the bottom of the precast pile; a lower node buried in the transfer beam and with the top extending out of the top of the transfer beam, wherein the bottom of the upper node is fixedly connected to the top of the lower node; At least one connecting member, one end of the connecting member is fixed to the surface of the upper node, and the other end of the connecting member is fixed to the surface of the lower node.

2. A connection node between a prefabricated column and a transfer beam as claimed in claim 1, characterized in that: The surfaces of the connection between the upper node and the lower node are aligned to form a connection plane, the connecting member includes a connection plate, both ends of the connection plate are provided with a through hole, each of the through holes is penetrated by a bolt, the upper node is provided with a first screw hole on the connection plane, the lower node is provided with a second screw hole on the connection plane, the distance between the first screw hole and the second screw hole is equal to the distance between the two through holes; wherein, one of the bolts is threadedly connected to the first screw hole, and the other bolt is threadedly connected to the second screw hole.

3. The connection node of a prefabricated column and a transfer beam according to claim 1, characterized in that: The transfer beam is a reinforced concrete structure, and a steel cage is buried inside the transfer beam. The part of the lower node pre-embedded in the conversion beam is inserted into the steel cage, and a connecting surface extending outward in a horizontal direction is provided on the lower node, and the top reinforcement of the steel cage is fixedly connected to the connecting surface.

4. The connection node of a prefabricated column and a transfer beam according to claim 1, characterized in that: The portion of the lower node pre-buried in the conversion beam is provided with a plurality of second shear nails for improving the connection strength between the lower node and the conversion beam.

5. The connection node of a prefabricated column and a transfer beam as claimed in claim 1, characterized in that: The upper node and the lower node are fixed by welding, and a welding groove is provided on the upper node / lower node at the connection with the lower node / upper node.

6. The connection node of a prefabricated column and a transfer beam as claimed in claim 1, characterized in that: It also includes an embedded part embedded in the precast pile, the bottom of the embedded part extends downward from the bottom of the precast pile and is fixed to the top of the upper node, and the surface of the embedded part is provided with a plurality of first shear nails for improving the connection strength between the embedded part and the precast pile.

7. A construction method for a connection node between a prefabricated column and a transfer beam, characterized in that: The following steps are involved: S1. Fix an upper node at the bottom of the precast pile, and fix a lower node at the bottom of the upper node, provide a connecting piece, and fix one end of the connecting piece to the upper node and the other end to the lower node; S2. Construct the transfer beam, and when constructing the transfer beam, pre-embed the bottom of the lower node in the transfer beam.

8. The construction method of the connection node of the prefabricated column and the transfer beam according to claim 3, characterized in that: The conversion beam is a concrete structure with a steel cage buried inside. The lower node is provided with a connecting surface extending outward in a horizontal direction. When constructing the conversion beam, the following steps are included: erecting the steel cage outside the lower node, fixing part of the top reinforcement of the steel cage to the connecting surface, and after the steel cage is erected, supporting the formwork and casting it to form the conversion beam.

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