Connecting structure of prefabricated beam column in node area

Abstract

The utility model relates to the technical field of fabricated buildings, in particular to a connecting structure of a prefabricated beam column in a node area, which comprises a longitudinal prefabricated frame beam, a transverse prefabricated frame beam, a frame column and configured reinforcing steel bars, the reinforcing steel bars configured in the longitudinal prefabricated frame beam comprise common reinforcing steel bars and steel strands, and the longitudinal prefabricated frame beam is provided with a laminated layer. A row of common steel bars and a row of steel strands are configured to extend into the node area; the transverse prefabricated frame beams are not provided with laminated layers, and the steel bars arranged on the transverse prefabricated frame beams and the steel bars arranged on the opposite transverse prefabricated frame beams are horizontally arranged in a staggered mode. The reinforcing steel bars arranged in the longitudinal prefabricated frame beams, the transverse prefabricated frame beams and the frame columns are mutually staggered; the steel strand of the longitudinal prefabricated frame beam mainly bears part of sagging moment in the midspan and at the bottom of the beam end, and the total number of steel bars at the bottom of the beam can be reduced. The steel strand of the transverse prefabricated frame beam mainly bears part of midspan sagging moment, and it is guaranteed that the inverted arch of the transverse prefabricated frame beam is consistent with that of the prefabricated plate.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled buildings, in particular to a connection structure of prefabricated beams and columns in a node area. Background Art

[0002] Most of the multi-storey industrial plants in my country adopt cast-in-place frame structures, with large floor heights and large spans. They use a lot of concrete and steel bars. The on-site formwork and wet concrete operations are quite large, requiring large investments, long construction periods, and serious noise and dust pollution. In response to the country's policy of vigorously promoting the modernization of the construction industry, more and more prefabricated construction methods have emerged. Compared with cast-in-place structures, in prefabricated construction methods, a large number of concrete components are produced indoors in the factory, which are not affected by natural conditions. They are cast in steel formworks, have good maintenance conditions, can be operated around the clock, are easy to control in quality, and have large output. Prefabricated components are transported to the site for installation, which saves formwork and scaffolding, reduces dust, reduces labor intensity, reduces high-altitude operations, shortens the construction period, and is civilized, with better comprehensive benefits.

[0003] However, prefabricated construction also has some defects of its own. The connection nodes of components are difficult to handle, especially the connection between beams and columns. The reliable anchoring of the main reinforcement of beams and columns in the frame nodes is the key to the safety of the frame structure. In the case of cast-in-place structures, the main reinforcement of beams and columns is placed in place in advance, and the concrete can be poured at one time, so the quality of beam-column nodes is guaranteed. The prefabricated components of the prefabricated structure are separated, and the beam-column nodes are poured after they are installed in place to form an overall frame. If the connection node does not have a good design and construction method, not only will the construction be difficult, but its quality will also be difficult to control, posing a hidden danger to the safety of the house structure. Tests conducted on prefabricated beam-column nodes by Southeast University and other universities have shown that the failure of frame structures mainly comes from the failure of connection nodes. At present, in the conventional prefabricated frame beam-column connection nodes, anchor steel bars are reserved at the ends of prefabricated beams and columns. Due to the large number of steel bars, it is difficult to avoid them, and they are easy to collide during installation. Direct cutting of the collision steel bars on site brings great safety hazards to the frame structure.

[0004] In the design of prefabricated workshops in existing projects, transverse prefabricated beams and prefabricated double T-plates are used. The transverse prefabricated beams are placed on the column brackets, and the longitudinal frame beams and columns are cast in situ with concrete. After the concrete strength reaches 80%, the double T-shaped prefabricated components are installed. The transverse prefabricated beams and double T-shaped prefabricated components cannot be installed at the same time, which increases the construction process. Another method is to use longitudinal prefabricated beams and prefabricated double T-plates. After the longitudinal prefabricated beams are hoisted, the transverse prefabricated beams are cast in situ with formwork, and then the prefabricated panels can be hoisted. The construction process is more complicated. The longitudinal and transverse frame beams form grids, which affect the crane's arm extension and movement, and hoisting is also more difficult. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies existing in the prior art, a connection structure of prefabricated beams and columns in the node area is provided, prefabricated beams are used in both the longitudinal and transverse directions, the anchoring steel bars of the prefabricated beams must not only meet the anchoring length in the column, but also avoid collision with the steel bars in the frame column, so as to achieve one-time lifting and one-time node casting.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a connection structure of prefabricated beams and columns in the node area, including longitudinal prefabricated frame beams, transverse prefabricated frame beams and frame columns and configured steel bars, wherein the frame columns are cast on site.

[0007] The steel bars arranged in the longitudinal prefabricated frame beam include ordinary steel bars and steel strands for bearing the positive bending moment at the mid-span and the bottom of the beam end. The longitudinal prefabricated frame beam is provided with a laminated layer. Several rows of ordinary steel bars and several rows of steel strands are arranged at the bottom end of the longitudinal prefabricated frame beam, wherein one row of ordinary steel bars and one row of steel strands extend into the node area, wherein the steel strands mainly bear the positive bending moment at the mid-span and the bottom of the beam end, thereby reducing the total number of steel bars at the bottom of the beam.

[0008] The steel bars arranged in the transverse prefabricated frame beam include ordinary steel bars and steel strands for bearing part of the mid-span positive bending moment. The transverse prefabricated frame beam does not have a laminated layer. The ordinary steel bars and steel strands of the transverse prefabricated frame beam are horizontally staggered with the ordinary steel bars and steel strands of the opposite transverse prefabricated frame beam. The transverse steel strands mainly bear part of the mid-span positive bending moment and ensure that the back arch of the transverse frame beam is consistent with the prefabricated plate.

[0009] The steel bars arranged in the frame column include ordinary steel bars,

[0010] The longitudinal prefabricated frame beams, transverse prefabricated frame beams and steel bars arranged in the frame columns are staggered. The spacing between the steel bars in the node area is designed according to the size to meet the construction accuracy requirements, thereby ensuring that no collision occurs between the steel bars.

[0011] Furthermore, a row of ordinary steel bars extending into the node area are arranged at the bottom end of the longitudinal prefabricated frame beam. In the node area, the ordinary steel bars on one side are straight, and the ordinary steel bars on the opposite side are bent upward, thus avoiding collision of the ordinary steel bars, and the steel strands automatically bend and slide down due to their own flexibility.

[0012] Alternatively, a row of common steel bars extending into the node area is arranged at the bottom end of the longitudinal prefabricated frame beam and extends to the center line of the frame column in the node area, and the common steel bars on both sides are overlapped and welded by short steel bars.

[0013] Furthermore, in the transverse prefabricated frame beam, several rows of ordinary steel bars and several rows of steel strands are arranged, each row of ordinary steel bars is provided with two steel bars extending into the node area, and the other ordinary steel bars do not extend into the node area, each row of steel strands is provided with two steel bars extending into the node area, and the other steel strands do not extend into the node area, and there is a vertical spacing between the ordinary steel bars and the steel strands.

[0014] Furthermore, among the rows of common steel bars arranged at the bottom end of the longitudinal prefabricated frame beam, one row of common steel bars is reserved to extend into the node area, and the remaining common steel bars do not extend into the node area to avoid collision with other steel bars;

[0015] Among the several rows of steel strands arranged at the bottom end of the longitudinal prefabricated frame beam, the lowest row of steel strands is retained to extend into the node area, and the remaining steel strands partially extend into the node area or do not extend into the node area. The lower row of steel strands meets the anchorage length in the node area, fully utilizes the strength at the support and the mid-span, and automatically bends and slides into place when falling due to its flexibility; the upper row of steel strands does not need to meet the anchorage length of the node area, only utilizes the strength at the mid-span, and only a small amount enters the node area or does not enter the node area to avoid collision with other steel bars.

[0016] Furthermore, the upper part of the longitudinal prefabricated frame beam is entirely provided with common steel bars, and all of them are placed when the superimposed layer is cast.

[0017] Furthermore, longitudinal corbels for supporting the longitudinal prefabricated frame beams and transverse corbels for supporting the transverse prefabricated frame beams are provided on the circumferential sides of the frame columns, and columns are provided between the transverse corbels and the transverse prefabricated frame beams.

[0018] The beneficial effects of the utility model are as follows: in the connection structure of the node area of ​​the utility model, the steel bars arranged in the longitudinal prefabricated frame beams, the transverse prefabricated frame beams and the frame columns are staggered with each other, so that all floor components (i.e. prefabricated beams and prefabricated panels) are fully prefabricated, all floor prefabricated components are installed at one time, and the beam-column nodes are cast at one time, which reduces the construction difficulty and improves the construction efficiency; the steel strands of the longitudinal prefabricated frame beams mainly bear part of the positive bending moment at the mid-span and the bottom of the beam ends, which can reduce the total number of steel bars at the bottom of the beam; the steel strands of the transverse prefabricated frame beams mainly bear part of the positive bending moment at the mid-span, and ensure that the arch of the transverse prefabricated frame beams is consistent with the prefabricated panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a structural schematic diagram of the utility model;

[0021] Figure 2 This utility model Figure 1 Schematic diagram of the cross section along the AA direction;

[0022] Figure 3 This utility model Figure 1 Schematic diagram of the cross section along the BB direction;

[0023] Figure 4 This utility model Figure 1 Schematic diagram of the cross section along the CC direction;

[0024] Figure 5 This utility model Figure 2 Schematic diagram of the cross section along the middle DD direction;

[0025] Figure 6 This utility model Figure 2 Schematic diagram of the cross section along the EE direction;

[0026] Figure 7 It is a structural schematic diagram of the outer hoop of the utility model;

[0027] Figure 8 It is another structural schematic diagram of the utility model;

[0028] Fig. 9 This utility model Figure 8 Schematic cross-section of the mid-node area;

[0029] Fig.10 It is a schematic diagram of the planar layout structure of the prefabricated frame beam and prefabricated panels of the utility model;

[0030] Fig.11 This is a structural schematic diagram of the utility model prefabricated frame beam column.

[0031] Numbers in the figure:

[0032] 1-Longitudinal prefabricated frame beams;

[0033] 2- transverse prefabricated frame beams;

[0034] 3-frame column, 31-first floor frame column, 32-second floor frame column, 33-third floor frame column;

[0035] 4- Prefabricated panels;

[0036] 51-longitudinal corbel, 52-transverse corbel, 52-prefabricated column;

[0037] 61- Construction joint 1, 62- Construction joint 2, 63- Construction joint 3, 64- Construction joint 4;

[0038] 71-ordinary steel bar, 72-steel strand, 73-short steel bar, 74-outer hoop, 75-inner hoop. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] Example 1

[0041] Figure 1-Figure 7 A connection structure of prefabricated beams and columns in a node area is shown, comprising a longitudinal prefabricated frame beam 1, a transverse prefabricated frame beam 2, a frame column 3 and configured steel bars, wherein the frame column 3 is cast on site.

[0042] The steel bars arranged in the longitudinal prefabricated frame beam 1 include ordinary steel bars 71 and steel strands 72 for bearing the positive bending moment at the mid-span and the bottom of the beam end. The longitudinal prefabricated frame beam 1 is provided with a laminated layer, and the bottom end of the longitudinal prefabricated frame beam 1 is provided with several rows of ordinary steel bars 71 and several rows of steel strands 72;

[0043] Among them, one row of ordinary steel bars 71 and one row of steel strands 72 extend into the node area, and the remaining ordinary steel bars 71 do not extend into the node area to avoid collision with other steel bars;

[0044] The lowest row of steel strands 72 are retained to extend into the node area, while the remaining steel strands 72 partially extend into the node area or do not extend into the node area. The lower row of steel strands meets the anchorage length in the node area, fully utilizes the strength at the supports and the mid-span, and relies on their flexibility to automatically bend and slide into place when falling; the upper row of steel strands does not need to meet the anchorage length in the node area, only utilizes the strength at the mid-span, and only a small amount enters the node area or does not enter the node area to avoid collision with other steel bars.

[0045] A row of common steel bars 71 extending into the node area is arranged at the bottom end of the longitudinal prefabricated frame beam 1. At the node area, the common steel bars 71 on one side are straight, and the longitudinal prefabricated frame beam 1 on this side is hoisted into place first, and the common steel bars 71 on the opposite side are bent upward, and the longitudinal prefabricated frame beam 1 on this side is hoisted into place later, so as to avoid collision of the common steel bars, and the steel strands automatically bend and slide into place by relying on their own flexibility;

[0046] The upper part of the longitudinal prefabricated frame beam 1 is completely provided with ordinary steel bars 71, and all of them are placed when pouring the superimposed layer.

[0047] The steel bars arranged in the transverse prefabricated frame beam 2 include ordinary steel bars 71 and steel strands 72 for bearing part of the mid-span positive bending moment. The transverse prefabricated frame beam 2 is not provided with a laminated layer. The ordinary steel bars 71 and steel strands 72 of the transverse prefabricated frame beam 2 are arranged horizontally staggered with the ordinary steel bars 71 and steel strands 72 of the opposite transverse prefabricated frame beam 2. The transverse steel strands mainly bear part of the mid-span positive bending moment and ensure that the back arch of the transverse frame beam is consistent with the prefabricated plate.

[0048] Several rows of common steel bars 71 and several rows of steel strands 72 are arranged in the transverse prefabricated frame beam 2. Two common steel bars 71 are arranged in each row to extend into the node area, and the other common steel bars 71 do not extend into the node area. Two steel strands 72 are arranged in each row to extend into the node area, and the other steel strands 72 do not extend into the node area. There is a vertical spacing between the common steel bars 71 and the steel strands 72. After the beam is hoisted, the protruding steel bars of the transverse prefabricated frame beams 2 on both sides of the frame column 3 are staggered in the horizontal direction to avoid collision.

[0049] The steel bars arranged in the frame column 3 include common steel bars 71. During construction, the positioning dimensions of the steel bars 71 need to be marked on the drawings of the frame column 3 to avoid the positions of the common steel bars 71 and the steel strands 72 of the prefabricated frame beams.

[0050] The steel bars arranged in the longitudinal prefabricated frame beam 1, the transverse prefabricated frame beam 2 and the frame column 3 are staggered. The spacing between the steel bars in the node area is designed according to the size to meet the construction accuracy requirements, so as to ensure that there is no collision between the steel bars.

[0051] A longitudinal corbel 51 supporting the longitudinal prefabricated frame beam 1 and a transverse corbel 52 supporting the transverse prefabricated frame beam 2 are arranged around the frame column 3 , and a column 53 is arranged between the transverse corbel 52 and the transverse prefabricated frame beam 2 .

[0052] The construction process includes the following steps: Fig.10 and Fig.11 As shown,

[0053] S1, pouring the first layer frame column 31 to the bottom elevation of the second layer longitudinal prefabricated frame beam 1, that is, the construction joint 61, the strength of the first layer frame column 31 to be poured reaches 80%;

[0054] S2, hoisting longitudinal prefabricated frame beam 1;

[0055] S3, hoisting transverse prefabricated frame beam 2 and prefabricated plate 4,

[0056] S4, placing the reinforcement of the superimposed layer of the longitudinal prefabricated frame beam 1 and the stirrups in the beam-column node area;

[0057] S5, pouring the concrete of the superimposed layer of the longitudinal prefabricated frame beam 1 and the beam-column node area to the second construction joint 62;

[0058] S6, pouring the second-floor frame column 32 to the bottom elevation of the third-floor longitudinal prefabricated frame beam 1, that is, the third construction joint 63, the strength of the second-floor frame column 32 to be poured reaches 80%, repeating S2-S5, pouring concrete to the fourth construction joint 64, completing the connection of the third-floor node area;

[0059] S7. Repeat S6 to complete the connection of the remaining layer height node areas.

[0060] When the placement surface of the prefabricated frame beam is uneven, mortar needs to be applied at the construction joint;

[0061] After the prefabricated columns 53 are hoisted to the transverse corbels 52, the transverse prefabricated frame beams 2 are hoisted, and mortar is used or rubber pads are provided between the transverse prefabricated frame beams 2 and the prefabricated columns 53;

[0062] like Figure 4 and Figure 7 The stirrups in the beam-column node area include an outer stirrup 74 and an inner stirrup 75, wherein the outer stirrup 74 can be made of two open stirrups inserted from both sides of the prefabricated frame beam and then overlapped and welded together, and the inner stirrup 75 can be made of a hook, which needs to hook the outer stirrup and the ordinary steel bar 71 of the frame column 3.

[0063] Example 2

[0064] like Figure 8 and Fig. 9 As shown, the difference from Example 1 is that:

[0065] A row of ordinary steel bars 71 extending into the node area are arranged at the bottom end of the longitudinal prefabricated frame beam 1 and extend to the center line of the frame column 3 in the node area to avoid collision of the ordinary steel bars 71 of the longitudinal prefabricated frame beam 1 on both sides of the frame column 3. The ordinary steel bars 71 on both sides are overlapped and welded by short steel bars 73 after the longitudinal prefabricated frame beam 1 is hoisted.

[0066] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A connection structure of prefabricated beams and columns in a node area, characterized in that: It comprises a longitudinal prefabricated frame beam (1), a transverse prefabricated frame beam (2), a frame column (3) and configured steel bars, The steel bars arranged in the longitudinal prefabricated frame beam (1) include ordinary steel bars (71) and steel strands (72) for bearing the positive bending moment at part of the mid-span and the bottom of the beam end. The longitudinal prefabricated frame beam (1) is provided with a laminated layer. The bottom end of the longitudinal prefabricated frame beam (1) is provided with several rows of ordinary steel bars (71) and several rows of steel strands (72), wherein one row of ordinary steel bars (71) and one row of steel strands (72) extend into the node area. The steel bars arranged in the transverse prefabricated frame beam (2) include ordinary steel bars (71) and steel strands (72) for bearing a portion of the mid-span positive bending moment. The transverse prefabricated frame beam (2) is not provided with a laminated layer. The ordinary steel bars (71) and steel strands (72) of the transverse prefabricated frame beam (2) are arranged horizontally staggered with the ordinary steel bars (71) and steel strands (72) of the opposite transverse prefabricated frame beam (2). The steel bars arranged in the frame column (3) include ordinary steel bars (71), The steel bars arranged in the longitudinal prefabricated frame beam (1), the transverse prefabricated frame beam (2) and the frame column (3) are staggered.

2. The connection structure of a prefabricated beam column in a node area according to claim 1, characterized in that: A row of common steel bars (71) extending into the node area is arranged at the bottom end of the longitudinal prefabricated frame beam (1). At the node area, the common steel bars (71) on one side are straight, and the common steel bars (71) on the opposite side are bent upward.

3. The connection structure of prefabricated beams and columns at the node area according to claim 1, characterized in that: A row of common steel bars (71) extending into the node area is arranged at the bottom end of the longitudinal prefabricated frame beam (1) and extends to the center line of the frame column (3) in the node area. The common steel bars (71) on both sides are overlapped and welded through short steel bars (73).

4. The connection structure of prefabricated beams and columns at the node area according to claim 1, characterized in that: The transverse prefabricated frame beam (2) is provided with several rows of common steel bars (71) and several rows of steel strands (72), each row of common steel bars (71) is provided with two steel bars extending into the node area, and the remaining common steel bars (71) do not extend into the node area, each row of steel strands (72) is provided with two steel strands extending into the node area, and the remaining steel strands (72) do not extend into the node area, and there is a vertical spacing between the common steel bars (71) and the steel strands (72).

5. The connection structure of prefabricated beams and columns at the node area according to claim 1, characterized in that: Among the rows of common steel bars (71) arranged at the bottom end of the longitudinal prefabricated frame beam (1), one row of common steel bars (71) is reserved to extend into the node area, and the remaining common steel bars (71) do not extend into the node area; Among the rows of steel strands (72) arranged at the bottom end of the longitudinal prefabricated frame beam (1), the lowest row of steel strands (72) is retained to extend into the node area, and the remaining steel strands (72) partially extend into the node area or do not extend into the node area.

6. The connection structure of prefabricated beams and columns at the node area according to claim 1, characterized in that: The upper part of the longitudinal prefabricated frame beam (1) is entirely provided with ordinary steel bars (71), and all of them are placed when pouring the superimposed layer.

7. The connection structure of prefabricated beams and columns at the node area according to claim 1, characterized in that: The frame column (3) is provided with a longitudinal corbel (51) supporting the longitudinal prefabricated frame beam (1) and a transverse corbel (52) supporting the transverse prefabricated frame beam (2) on its circumferential side, and a prefabricated column (53) is provided between the transverse corbel (52) and the transverse prefabricated frame beam (2).

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