Reinforced concrete fabricated beam-column wet connection joint and construction method thereof

Abstract

The invention discloses a reinforced concrete fabricated beam-column wet connection joint and a construction method thereof. The fabricated reinforced concrete frame is one of the main application forms of a fabricated concrete structure. Brackets are arranged at the tops of the prefabricated lower-layer columns, meanwhile, support negative reinforcements are arranged at supports of the prefabricated part of the superposed beam, the requirements for hoisting, erecting and beam end shear resistance of the prefabricated part of the superposed beam are met, longitudinal reinforcements of the upper-layer prefabricated column and the lower-layer prefabricated column are connected through straight threaded sleeves, and beam-column joints are achieved through two-time pouring. According to the method, the bearing capacity of the precast beam can be effectively improved, the requirement for erecting the large-span and large-section precast beam is met, and the problem that the large-span and large-section precast beam end is insufficient in shear resistance is solved. And meanwhile, the hoisting overturning risk of the large-span and large-section precast beam is effectively reduced, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure and construction, and particularly relates to a reinforced concrete assembled beam-column wet connection node and a construction method thereof. Background Art

[0002] Prefabricated concrete structure is a new type of building production method that realizes sustainable development, energy saving, environmental protection, and maximizes the life cycle of building products. Prefabricated reinforced concrete frame is one of the main application forms of prefabricated concrete structure. Therefore, promoting prefabricated reinforced concrete frame is one of the important ways to develop prefabricated buildings in my country.

[0003] There are 23 earthquake zones in my country's territory, making it one of the countries with the most severe earthquake disasters in the world. Building structures are facing a relatively serious threat of earthquake disasters. A large number of earthquake disaster studies at home and abroad have shown that the typical form of damage to reinforced concrete prefabricated frame structures under earthquake disasters is the destruction of connections between prefabricated components, and the resulting overall structural dispersion and collapse. Therefore, stable and effective component connection nodes are the basic prerequisite for ensuring the overall seismic performance of reinforced concrete prefabricated frame structures, and are also the basis for the study of the overall seismic performance of such structural systems.

[0004] The existing relevant technical regulations in China all adopt the post-cast integral connection method, that is, beams and columns are prefabricated components, and the beam-column connection nodes are cast-in-place, that is, the beam-column wet connection nodes. This method adopts the design principle of "equivalent to cast-in-place", which can ensure the effective connection of the nodes and is more suitable for small-span and small-section beam-column nodes. When the building function requires a larger column span, resulting in a larger beam section and a larger prefabricated beam weight, the traditional wet connection nodes cannot meet the requirements of beam end shear resistance and cast-in-place composite beam and composite slab construction. The prefabricated beam erection and prefabricated slab erection construction have a greater risk of overturning of prefabricated beams. At the same time, the upper and lower column load-bearing longitudinal reinforcement is limited by the number of steel bars in the core area of ​​the node, which makes construction more difficult. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art, the present invention provides a reinforced concrete prefabricated beam-column wet connection node and a construction method thereof, which improves the bearing capacity of prefabricated beams, meets the needs of erecting prefabricated beams with large spans and large cross-sections, and solves the problem of insufficient shear resistance at the ends of prefabricated beams with large spans and large cross-sections.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A reinforced concrete assembled beam-column wet connection node, characterized in that it comprises a vertically arranged prefabricated upper column and a prefabricated lower column, and a horizontally arranged composite beam;

[0008] The prefabricated upper column is provided with prefabricated upper column longitudinal reinforcement, the prefabricated lower column is provided with prefabricated lower column longitudinal reinforcement, and the prefabricated upper column longitudinal reinforcement and the prefabricated lower column longitudinal reinforcement are fixedly connected;

[0009] The prefabricated lower column corbel is arranged on the top of the prefabricated lower column;

[0010] And set column stirrups in the core area of ​​the node;

[0011] The composite beam comprises a prefabricated composite beam part and a cast-in-place composite beam part, and the prefabricated composite beam part is erected on the top surface of the prefabricated lower column corbel.

[0012] Furthermore, the prefabricated upper column longitudinal reinforcement and the prefabricated lower column longitudinal reinforcement are connected by a steel bar straight threaded sleeve.

[0013] Furthermore, the prefabricated upper column longitudinal reinforcement and the prefabricated lower column longitudinal reinforcement are aligned.

[0014] Furthermore, the prefabricated upper column includes an end close to the lower beam-column node and an end away from the lower beam-column node, and the end close to the lower beam-column node is provided with a rough surface for facilitating secondary concrete pouring.

[0015] Furthermore, the prefabricated upper column longitudinal reinforcement is arranged at one end close to the lower beam-column node.

[0016] Furthermore, the prefabricated part of the composite beam is provided with ears of the prefabricated part of the composite beam on both sides of the top of the beam for the erection of the upper prefabricated plate, and a prefabricated part of the composite beam is provided with a recess of the prefabricated part of the composite beam in the middle of the top of the beam.

[0017] Furthermore, the bottom of the composite beam prefabricated part is provided with lower longitudinal reinforcement of the composite beam prefabricated layer, and the top of the composite beam prefabricated layer support is provided with top longitudinal reinforcement.

[0018] Furthermore, the prefabricated part of the composite beam adopts U-shaped prefabricated beam stirrups, and a stirrup cap is arranged on the upper part and placed in the cast-in-place part of the composite beam.

[0019] Furthermore, longitudinal reinforcement at the top of the cast-in-place layer support of the composite beam is arranged in the cast-in-place part of the composite beam.

[0020] A construction method for a reinforced concrete assembled beam-column wet connection node comprises the following steps:

[0021] Step 1: Prefabricate the lower column including the corbels in the prefabrication plant and hoist it;

[0022] Step 2: prefabricate the prefabricated part of the composite beam in the prefabrication plant, and hoist and install it on the top surface of the prefabricated lower column corbel;

[0023] Step 3: Set up the formwork and cast and maintain the first beam-column connection node. The casting height is up to the top of the prefabricated part of the composite beam, and the top surface of the cast-in-place layer is roughened;

[0024] Step 4: Hoist the prefabricated upper column so that the axis of the prefabricated upper column is aligned with the axis of the prefabricated lower column, and ensure that the longitudinal reinforcement of the prefabricated upper column is aligned with the longitudinal reinforcement of the prefabricated lower column, and connect them through the steel bar straight threaded sleeve;

[0025] Step 5: Prefabricate the composite slabs in the prefabrication plant and erect them according to the design;

[0026] Step 6: Set up the formwork for the second time and cast the beam-column joints for the second time, and then maintain them.

[0027] Beneficial effects of the present invention:

[0028] 1) The reinforced concrete assembled beam-column wet connection node of the present invention sets a corbel on the prefabricated lower column, reinforces the prefabricated beam section with negative moment, and casts the beam-column node twice, which greatly improves the bearing capacity of the prefabricated beam, meets the requirements of erecting prefabricated beams with large spans and large cross-sections, and solves the problem of insufficient shear resistance at the ends of prefabricated beams with large spans and large cross-sections;

[0029] 2) The reinforced concrete assembled beam-column wet connection node of the present invention is cast in two times, which effectively reduces the risk of overturning during the installation of large-span and large-section prefabricated beams and ensures construction safety;

[0030] 3) In the reinforced concrete assembled beam-column wet connection node of the present invention, the prefabricated lower column longitudinal reinforcement is connected with the upper column longitudinal reinforcement by a straight threaded sleeve, and the top support reinforcement of the composite beam is arranged in the cast-in-place layer. The force transmission path of the structural member is clear and the force is reasonable. It can effectively reduce the construction difficulty and speed up the assembly speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the reinforced concrete assembled beam-column wet connection node of the present invention;

[0032] Figure 2 It is a schematic diagram of the exploded structure of the reinforced concrete assembled beam-column wet connection node according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the exploded structure of a prefabricated column according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the exploded structure of a prefabricated beam according to an embodiment of the present invention;

[0035] Figure 5 It is a schematic diagram of a method for implementing a reinforced concrete assembled beam-column wet connection node according to an embodiment of the present invention;

[0036] In the figure: 1. Precast upper column, 2. Precast upper column longitudinal reinforcement, 3. Precast lower column, 4. Precast lower column corbel, 5. Precast lower column longitudinal reinforcement, 6. Composite beam, 7. Precast part of composite beam, 8. Cast-in-place part of composite beam, 9. Beam-column wet connection node, 10. Steel bar straight threaded sleeve, 11. Column stirrups in the core area of ​​the node, 12. Top longitudinal reinforcement of the cast-in-place layer support of composite beam, 13. Precast beam stirrups, 14. Stirrup caps, 15. Top longitudinal reinforcement of the precast layer support of composite beam, 16. Lower longitudinal reinforcement of the precast layer of composite beam, 17. Ear of the precast part of composite beam, 18. Notch of the precast part of composite beam. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific implementation modes.

[0038] like Figure 1-4 As shown, the present invention comprises a vertically arranged prefabricated upper column 1 and a prefabricated lower column 3, and a horizontally arranged composite beam 6; a prefabricated upper column longitudinal reinforcement 2 is arranged in the prefabricated upper column 1, a prefabricated lower column longitudinal reinforcement 5 is arranged in the prefabricated lower column 3, the prefabricated upper column longitudinal reinforcement 2 and the prefabricated lower column longitudinal reinforcement 5 are connected by a steel bar straight threaded sleeve 10, and the prefabricated upper column longitudinal reinforcement 2 and the prefabricated lower column longitudinal reinforcement 5 are arranged in alignment. The prefabricated upper column longitudinal reinforcement 2 is arranged at one end close to the lower beam-column node, and a column stirrup 11 in the core area of ​​the node is arranged.

[0039] The prefabricated upper column 1 includes an end close to the lower beam-column node and an end away from the lower beam-column node. The end close to the lower beam-column node is provided with a rough surface for facilitating secondary concrete pouring.

[0040] The prefabricated lower column corbel 4 is arranged at the top of the prefabricated lower column 3; the prefabricated lower column corbel 4 should meet the requirements of the composite beam 6 erection, and meet the requirements of the upper plate erection and construction load. The cross section of the prefabricated lower column corbel 4 is determined according to the cross section of the erected beam and the shear bearing capacity calculation requirements. Generally, the width of the prefabricated lower column corbel is not less than the width of the beam cross section, and the length of the corbel is not less than 1 times the beam height.

[0041] The composite beam 6 includes a composite beam prefabricated part 7 and a composite beam cast-in-place part 8. The composite beam prefabricated part 7 is erected on the top surface of the prefabricated lower column corbel 4. The composite beam prefabricated part 7 is provided with composite beam prefabricated part ears 17 on both sides of the top of the beam for the erection of the upper prefabricated plate, and a composite beam prefabricated part notch 18 is provided in the middle of the top of the beam for the entire length to ensure that the composite beam prefabricated part 7 and the composite beam cast-in-place part 8 have a good overlapping effect and stable cooperative working performance. The bottom of the composite beam prefabricated part 7 is provided with a composite beam prefabricated layer lower longitudinal reinforcement 16, and the top of the composite beam prefabricated layer support is provided with a composite beam prefabricated layer support top longitudinal reinforcement 15, which meets the erection and construction load requirements of the composite beam cast-in-place part 8 and the composite plate.

[0042] The prefabricated part 7 of the composite beam adopts U-shaped prefabricated beam stirrups 13, and stirrup caps 14 are arranged on the upper part, which are placed in the cast-in-place part 8 of the composite beam. The top longitudinal reinforcement 12 of the cast-in-place layer support of the composite beam is arranged in the cast-in-place part 8 of the composite beam to meet the requirements of the normal use limit state and the bearing capacity limit state of the beam.

[0043] The lower longitudinal reinforcement 16 of the composite beam precast layer is arranged at the lower part of the composite beam precast part 7 and extends to the beam-column wet connection node. The top longitudinal reinforcement 15 of the composite beam precast layer support is arranged at the top of the composite beam precast part 7 and extends to the beam-column wet connection node. The top longitudinal reinforcement 12 of the composite beam cast-in-place layer support is arranged in the composite beam cast-in-place layer 8 and extends to the beam-column wet connection node.

[0044] The number of 15 longitudinal bars at the top of the precast layer support of the composite beam is determined based on the requirements of the load bearing capacity, cracks, etc. of the cast-in-place part of the composite beam, the erection of the composite slab, and the upper construction after the precast beam is erected and poured for the first time, and the length meets the basic structural requirements. The number of 12 longitudinal bars at the top of the cast-in-place layer support of the composite beam is determined based on the required combined envelope calculation of the working conditions such as the dead load, live load, wind load, and earthquake load of the structure, and the length meets the basic structural requirements.

[0045] The longitudinal reinforcement 15 at the top of the precast layer support of the composite beam meets the requirements of shear force, bending moment, cracks, etc. at the beam end under working conditions such as the erection of the composite beam 6, the erection of the composite slab, the construction of the cast-in-place part 8 of the composite beam, and the construction of the composite slab.

[0046] The construction method of the reinforced concrete assembled beam-column wet connection node of the present invention comprises the following steps:

[0047] Step 1: prefabricate the lower column 3 including the corbels in the prefabrication plant and hoist it;

[0048] Step 2: prefabricate the prefabricated part 7 of the composite beam in the prefabrication plant, and hoist and install it on the top surface of the prefabricated lower column corbel 4;

[0049] Step 3: Set up the formwork and cast and maintain the first beam-column connection node. Cast to the top of the prefabricated part of the composite beam 7, and roughen the top surface of the cast-in-place layer. Figure 5 As shown;

[0050] Step 4: hoist the prefabricated upper column 1 so that the axis of the prefabricated upper column 1 is aligned with the axis of the prefabricated lower column 3, and ensure that the prefabricated upper column longitudinal reinforcement 2 is aligned with the prefabricated lower column longitudinal reinforcement 5, and connect them through the steel bar straight threaded sleeve 10;

[0051] Step 5: Prefabricate the composite slabs in the prefabrication plant and erect them according to the design;

[0052] Step 6: Set up the formwork for the second time and cast the beam-column joints for the second time, and maintain them. Figure 5 shown.

[0053] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A reinforced concrete assembled beam-column wet connection node, characterized in that: It comprises a prefabricated upper column (1) and a prefabricated lower column (3) arranged vertically, and a composite beam (6) arranged horizontally; The prefabricated upper column (1) is provided with prefabricated upper column longitudinal reinforcement (2), the prefabricated lower column (3) is provided with prefabricated lower column longitudinal reinforcement (5), and the prefabricated upper column longitudinal reinforcement (2) and the prefabricated lower column longitudinal reinforcement (5) are fixedly connected; The prefabricated lower column corbel (4) is arranged on the top of the prefabricated lower column (3); and setting column stirrups (11) in the core area of ​​the node; The composite beam (6) comprises a composite beam prefabricated part (7) and a composite beam cast-in-place part (8), wherein the composite beam prefabricated part (7) is erected on the top surface of the prefabricated lower column corbel (4).

2. The reinforced concrete assembled beam-column wet connection node according to claim 1 is characterized in that: The prefabricated upper column longitudinal reinforcement (2) and the prefabricated lower column longitudinal reinforcement (5) are connected via a steel bar straight threaded sleeve (10).

3. The reinforced concrete assembled beam-column wet connection node according to claim 2 is characterized in that: The prefabricated upper column longitudinal reinforcement (2) and the prefabricated lower column longitudinal reinforcement (5) are arranged in alignment.

4. The reinforced concrete assembled beam-column wet connection node according to claim 3 is characterized in that: The prefabricated upper column (1) comprises an end close to the lower beam-column node and an end away from the lower beam-column node, and the end close to the lower beam-column node is provided with a rough surface for facilitating secondary concrete pouring.

5. The reinforced concrete assembled beam-column wet connection node according to claim 4 is characterized in that: The prefabricated upper column longitudinal reinforcement (2) is arranged at one end close to the lower beam-column node.

6. The reinforced concrete assembled beam-column wet connection node according to claim 5, characterized in that: The composite beam prefabricated part (7) is provided with composite beam prefabricated part ears (17) on both sides of the beam top for the entire length, which are used for erecting the upper prefabricated plate, and a composite beam prefabricated part notch (18) is provided in the middle of the beam top for the entire length.

7. The reinforced concrete assembled beam-column wet connection node according to claim 6, characterized in that: The bottom of the composite beam prefabricated part (7) is provided with composite beam prefabricated layer lower longitudinal reinforcement (16), and the top of the composite beam prefabricated layer support is provided with composite beam prefabricated layer support top longitudinal reinforcement (15).

8. The reinforced concrete assembled beam-column wet connection node according to claim 7, characterized in that: The composite beam prefabricated part (7) adopts U-shaped prefabricated beam stirrups (13), and a stirrup cap (14) is arranged on the upper part and placed in the composite beam cast-in-place part (8).

9. The reinforced concrete assembled beam-column wet connection node according to claim 8, characterized in that: The composite beam cast-in-place part (8) is provided with a composite beam cast-in-place layer support top longitudinal reinforcement (12).

10. A construction method for a reinforced concrete assembled beam-column wet connection node, characterized in that: The steps include: Step 1: prefabricate the lower column (3) including the bracket in the prefabrication plant and hoist it; Step 2: prefabricate the prefabricated part of the composite beam (7) in the prefabrication plant, and hoist and install it on the top surface of the prefabricated lower column corbel (4); Step 3: Set up the formwork and cast and maintain the first beam-column connection node, with the casting height reaching the top of the prefabricated part (7) of the composite beam, and roughening the top surface of the cast-in-place layer; Step 4: hoist the prefabricated upper column (1) so that the axis of the prefabricated upper column (1) and the prefabricated lower column (3) are aligned, and the prefabricated upper column longitudinal reinforcement (2) and the prefabricated lower column longitudinal reinforcement (5) are aligned and connected through the steel bar straight threaded sleeve (10); Step 5: Prefabricate the composite slabs in the prefabrication plant and erect them according to the design; Step 6: Set up the formwork for the second time and cast the beam-column joints for the second time, and then maintain them.

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