Prefabricated concrete cavity column and prefabricated composite column cap combined connection node structure

Abstract

The utility model discloses a prefabricated concrete cavity column and prefabricated composite column cap combined connection node structure which comprises a lower floor, a prefabricated concrete cavity column, a prefabricated composite column cap and a supporting system, an occlusion key groove is formed in the middle of a column wall, and the prefabricated composite column cap comprises a prefabricated part and a cast-in-place part. The sleeve opening is connected to the outer side surface of the column wall and the position of the meshing key groove in a sleeving mode, concrete of the prefabricated part comprises a horizontal plate body and a plate outer edge annular thickening part, a plate edge ring beam is arranged at the position of the plate outer edge annular thickening part, concrete of the cast-in-place part is connected with the meshing key groove in a meshing mode, and the supporting system comprises a cap bottom vertical scaffold support and a cap bottom bracket support. According to the prefabricated composite column cap, the connection mode is converted into connection between the prefabricated concrete cavity column and the prefabricated composite column cap, the problem of connection between a traditional prefabricated concrete cavity column and a horizontal component is effectively solved, the meshing key grooves are formed in the column wall to form a shear-resistant structure, the connection technology is simplified, and the construction and installation accuracy and quality are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of building assembly, in particular to a combined connection node structure of a prefabricated concrete cavity column and a prefabricated composite column cap. Background Art

[0002] Prefabricated buildings are structures assembled on-site using various prefabricated components. In recent years, prefabricated buildings have experienced rapid growth in my country, leading to the emergence of prefabricated monolithic frame structures. Prefabricated columns are a common component in these structures. The connection nodes between prefabricated columns, a crucial component of prefabricated structures, have long been a challenge in prefabricated frame structures.

[0003] Current precast column node connections include precast cavity column nodes. These columns are constructed using a formwork constructed of concrete greater than 80mm thick, with a steel cage consisting of welded stirrup mesh and column longitudinal reinforcement placed inside. When connecting a precast cavity column to a horizontal member, the horizontal member's reinforcements must be plugged into a pre-reserved horizontal sleeve on the column, as is done with other horizontal member-column connections. However, the thickness of the precast cavity column formwork prevents the installation of adjustable straight-threaded sleeves or combined extrusion sleeves. Even if the precast cavity column's wall thickness is increased to accommodate the sleeves, with the reinforcement at both ends connected via extrusion sleeves, the reserved reinforcement at that location and the sleeve's process performance are still very demanding, consuming considerable time during installation to align the sleeves.

[0004] Especially when this method is applied to a beamless floor structure system, if the horizontal components are not connected with reinforcement, the shear resistance between the floor slab and the prefabricated cavity columns cannot be guaranteed.

[0005] Therefore, there is an urgent need for a precast concrete cavity column and a precast composite column cap combined connection node structure to solve the problems existing when the precast concrete cavity column is connected to the horizontal member. Utility Model Content

[0006] The purpose of the utility model is to provide a combined connection node structure of a prefabricated concrete cavity column and a prefabricated composite column cap, in order to solve the technical problems in the existing prefabricated system that a lot of time is wasted in aligning and installing sleeves when connecting the prefabricated cavity column with the horizontal member, and the shear resistance between the cavity column and the horizontal member cannot be guaranteed.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A combined connection node structure of precast concrete cavity columns and precast composite column caps, comprising a lower floor, precast concrete cavity columns, precast composite column caps and a support system.

[0009] The precast concrete cavity column includes a column wall and a central column hole. A bite keyway is provided in the middle of the column wall. The bite keyway is wavy and has a trapezoidal cross section. The column wall corresponding to the setting range of the bite keyway thickens toward the central column hole.

[0010] The prefabricated composite column cap includes a prefabricated part and a cast-in-place part. The middle part of the prefabricated part is provided with a sleeve adapted to the shape of the column wall. The sleeve is sleeved on the outer surface of the column wall and engages with the keyway.

[0011] The concrete of the prefabricated part includes a horizontal plate body and an annular thickening portion at the outer edge of the plate. The annular thickening portion at the outer edge of the plate is provided with a plate edge ring beam.

[0012] The cast-in-place part is set on the upper side of the prefabricated part, and the concrete of the cast-in-place part is engaged with the bite keyway.

[0013] The support system includes a base vertical scaffolding support and a base corbel support. The bottom of the base vertical scaffolding support stands on the lower floor, and the top of the base vertical scaffolding support is supported in the center of the prefabricated part. The base corbel support is fixedly connected to the concave angle formed by the column wall and the horizontal plate, and supported on the bottom surface of the horizontal plate.

[0014] The bottom bracket support is a section of angle steel, which is arranged on the four sides of the column wall. The angle steel opening faces outward and includes a horizontal limb, a vertical limb and a reinforcement plate. The reinforcement plate is fixedly connected between the horizontal limb and the vertical limb. The vertical limb is close to the surface of the column wall. A horizontal sleeve is pre-embedded on the column wall corresponding to the position of the vertical limb. Bolt holes are opened on the vertical limb. The bolt holes correspond to the openings of the sleeve and are anchored by detachable anchor bolts. The horizontal limb supports the bottom surface of the horizontal plate.

[0015] A pressing groove is provided on the bottom surface of the inner edge of the horizontal plate body. The length of the pressing groove is equal to the length of the horizontal limb. The pressing groove is clamped on the horizontal limb. A chamfer is provided on the top surface of the inner edge of the horizontal plate body.

[0016] The reinforcement of the prefabricated composite column cap includes the cap bottom longitudinal reinforcement, cap top longitudinal reinforcement and cap body stirrups. The cap bottom longitudinal reinforcement is located in the prefabricated part, the cap top longitudinal reinforcement is located in the cast-in-place part, the top of the cap body stirrups is connected to the cap top longitudinal reinforcement, and the bottom of the cap body stirrups is connected to the cap bottom longitudinal reinforcement.

[0017] The cap body stirrups are open-type stirrups, which are composed of U-shaped bars and top cover bars. The U-shaped bars are located in the horizontal plate body, and the ends of the two limbs of the U-shaped bars are fixedly connected to the two ends of the top cover bars.

[0018] The top end of the outer leg of the U-shaped reinforcement is curled at the annular thickening part of the outer edge of the slab to form the slab edge ring beam stirrups. The slab edge ring beam stirrups enclose the slab edge top longitudinal reinforcement, slab edge waist longitudinal reinforcement and slab edge bottom longitudinal reinforcement of the slab edge ring beam. Among them, the slab edge waist longitudinal reinforcement and slab edge bottom longitudinal reinforcement are located in the annular thickening part of the outer edge of the slab, and the slab edge top longitudinal reinforcement is located in the cast-in-place part.

[0019] An inward-bending hook is provided at the top of the inner limb of the U-shaped reinforcement, and the inner top longitudinal reinforcement of the plate is provided inside the hook.

[0020] The longitudinal reinforcement at the bottom of the cap is located on the upper side of the U-shaped reinforcement, and the longitudinal reinforcement at the top of the cap is located on the upper side of the top cover reinforcement.

[0021] A cap ring beam is also provided in the prefabricated composite column cap. The reinforcement of the cap ring beam includes the cap bottom longitudinal reinforcement, the cap top longitudinal reinforcement and the cap stirrups. The cap bottom longitudinal reinforcement is located in the horizontal plate body, the cap top longitudinal reinforcement is located on the lower side of the top cover reinforcement, and the cap stirrups are enclosed on the outside of the cap bottom longitudinal reinforcement and the cap top longitudinal reinforcement.

[0022] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0023] According to the characteristics of precast concrete cavity columns, the utility model adopts a method of arranging precast composite column caps on the outer periphery of the column wall. The precast column caps are prefabricated in the factory and transported to the construction site for assembly. The concrete of the cast-in-place part is poured on the precast part to form a whole. The utility model has the characteristics of fast construction speed, short construction period, high production efficiency, good product quality, etc., and reduces the amount of on-site steel bar binding and concrete pouring work.

[0024] In the present invention, an interlocking keyway is provided in the column wall, and the concrete of the cast-in-place part forms a shear structure on the column side here. The inner limb of a U-shaped reinforcement is also provided in the shear structure to strengthen the connection of the concrete. The bottom of the prefabricated composite column cap is supported by the cap bottom corbel of the angle steel. The end of the prefabricated part and the overlap position of the cap bottom corbel support are provided with a pressure groove, which is pressed on the horizontal limb of the angle steel to further enhance the connection stability of the prefabricated part. The outer edge of the prefabricated composite column cap is provided with a thickened part, and the thickened part is provided with a plate edge ring beam, which can transmit force when the prefabricated composite column cap is connected to other horizontal components. The prefabricated composite column cap is also provided with a cap middle ring beam to further enhance the strength of the prefabricated composite column cap itself.

[0025] The utility model arranges a row of scaffolds and corbel supports at the position of the prefabricated superimposed column caps, and the scaffolds do not need to be continuously supported at this position, thereby ensuring the supporting environment of the scaffolds.

[0026] The utility model does not require precise positioning of steel bars and reserved holes between the precast concrete cavity column and the precast composite column cap, and converts the connection between the precast concrete cavity column and the horizontal component into a connection between the precast concrete cavity column and the precast composite column cap, effectively solving the connection problem between the traditional precast concrete cavity column connection and the horizontal component, simplifying the connection construction process, improving the component quality, greatly improving the construction efficiency, and ensuring the accuracy and quality of construction and installation.

[0027] The utility model can greatly improve the assembly rate of prefabricated components, shorten the construction period and reduce costs while meeting the force requirements of the construction and installation stage and the normal working stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Figure 1 It is a side structural schematic diagram of the utility model.

[0030] Figure 2 It is a partially enlarged schematic diagram of the composite column cap of the present invention.

[0031] Figure 3 It is a schematic diagram of the planar structure of the prefabricated part of the composite column cap of the present invention.

[0032] Figure 4 It is a side structural schematic diagram of the prefabricated part of the composite column cap of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the U-shaped rib of the utility model.

[0034] Figure 6 It is a structural schematic diagram of the groove pressing and chamfering of the horizontal plate body of the utility model.

[0035] Figure 7 It is a schematic diagram of the planar structure of the cap bottom corbel support of the utility model.

[0036] Figure 8 It is a structural schematic diagram of the utility model applied to a cast-in-place floor.

[0037] Figure numbers: 1-lower floor, 2-precast concrete cavity column, 21-column wall, 22-central column hole, 23-occlusal keyway, 3-composite column cap, 31-precast part, 32-cast-in-place part, 311-horizontal plate, 312-annular thickening part on the outer edge of the plate, 313-pressed groove, 314-chamfer, 33-longitudinal reinforcement at the bottom of the cap, 34-longitudinal reinforcement at the top of the cap, 35-stirrup reinforcement at the cap body, 351-U-shaped reinforcement, 352-top cover reinforcement, 353-hook, 354-top longitudinal reinforcement in the plate, 36-sleeve, 4-vertical scaffolding at the bottom of the cap Support, 5- bottom cap corbel support, 51- horizontal limb, 52- vertical limb, 53- sleeve, 54- reinforcing plate, 6- anchor bolt, 7- plate edge ring beam, 71- plate edge ring beam stirrups, 72- plate edge top longitudinal reinforcement, 73- plate edge waist longitudinal reinforcement, 74- plate edge bottom longitudinal reinforcement, 8- cap middle ring beam, 81- cap middle bottom longitudinal reinforcement, 82- cap middle top longitudinal reinforcement, 83- cap middle stirrups, 9- cast-in-place floor slab concrete, 10- cast-in-place floor slab scaffolding support frame, 11- cast-in-place floor slab bottom formwork, 12- cast-in-place floor slab secondary purlin, 13- cast-in-place floor slab main purlin. DETAILED DESCRIPTION

[0038] For example, see Figure 1-7As shown, a combined connection node structure of precast concrete cavity columns and precast composite column caps includes a lower floor 1, precast concrete cavity columns 2, precast composite column caps 3 and a support system.

[0039] The precast concrete cavity column 2 includes a column wall 21 and a central column hole 22. An engaging keyway 23 is provided in the middle of the column wall 21. The engaging keyway 23 is wavy and has a trapezoidal cross section. The column wall 21 corresponding to the setting range of the engaging keyway 23 thickens toward the central column hole 22.

[0040] The prefabricated composite column cap 3 comprises a prefabricated portion 31 and a cast-in-place portion 32. A slot 36 adapted to the column wall's shape is defined in the center of the prefabricated portion 31. The slot 36 fits over the outer surface of the column wall 21, where it engages the keyway 23. The cast-in-place portion 32 is positioned above the prefabricated portion 31, with the concrete in the cast-in-place portion 32 engaging the keyway 23.

[0041] The concrete of the prefabricated part 31 includes a horizontal plate body 311 and an annular thickened portion 312 at the outer edge of the plate. A plate edge ring beam 7 is provided at the position of the annular thickened portion 312 at the outer edge of the plate.

[0042] See also Figure 2 As shown, the reinforcement of the prefabricated composite column cap 3 includes a cap bottom longitudinal reinforcement 33, a cap top longitudinal reinforcement 34 and a cap body stirrup 35. The cap bottom longitudinal reinforcement 33 is located in the prefabricated part 31, the cap top longitudinal reinforcement 34 is located in the cast-in-place part 32, the top of the cap body stirrup 35 is connected to the cap top longitudinal reinforcement 34, and the bottom of the cap body stirrup 35 is connected to the cap bottom longitudinal reinforcement 33.

[0043] In this embodiment, the cap body stirrup 35 is an open type stirrup, which is composed of a U-shaped rib 351 and a top cover rib 352. The U-shaped rib 351 is located in the horizontal plate body 311, and the ends of the two limbs of the U-shaped rib 351 are fixedly connected to the two ends of the top cover rib 352.

[0044] The top end of the outer limb of the U-shaped reinforcement 351 is curled at the annular thickening portion 312 of the outer edge of the plate to form the plate edge ring beam stirrup 71, and the plate edge ring beam stirrup 71 encloses the plate edge top longitudinal reinforcement 72, plate edge waist longitudinal reinforcement 73 and plate edge bottom longitudinal reinforcement 74 of the plate edge ring beam 7, among which the plate edge waist longitudinal reinforcement 73 and the plate edge bottom longitudinal reinforcement 74 are located at the annular thickening portion 312 of the outer edge of the plate, and the plate edge top longitudinal reinforcement 72 is located at the cast-in-place portion 32.

[0045] The top end of the inner limb of the U-shaped rib 351 is provided with an inward-bending hook 353 , and the inner top longitudinal rib 354 of the plate is provided inside the hook 353 .

[0046] The bottom longitudinal rib 33 is located above the U-shaped rib 351 , and the top longitudinal rib 34 is located above the top cover rib 352 .

[0047] A cap ring beam 8 is also provided in the prefabricated composite column cap 3. The steel bars of the cap ring beam 8 include a cap bottom longitudinal bar 81, a cap top longitudinal bar 82 and a cap stirrup 83. The cap bottom longitudinal bar 81 is located in the horizontal plate body 311, the cap top longitudinal bar 82 is located on the lower side of the top cover bar 352, and the cap stirrup 83 is enclosed on the outside of the cap bottom longitudinal bar 81 and the cap top longitudinal bar 82.

[0048] See also Figure 1 As shown, the support system includes a bottom vertical scaffolding support 4 and a bottom corbel support 5. The bottom of the bottom vertical scaffolding support 4 stands on the lower floor 1, and the top of the bottom vertical scaffolding support 4 is supported in the center of the prefabricated part 31;

[0049] See also Figure 2 and Figure 7 As shown, the base corbel support 5 is fixedly connected to the inner corner formed by the column wall 21 and the horizontal plate 311, and supported on the bottom surface of the horizontal plate 311. The base corbel support 5 is a section of angle steel, provided on the four sides of the column wall 21, with the angle steel opening facing outward, and includes a horizontal limb 51, a vertical limb 52, and a reinforcing plate 54. The reinforcing plate 54 is fixedly connected between the horizontal limb 51 and the vertical limb 52. The vertical limb 52 is closely attached to the surface of the column wall 21. A horizontal sleeve 53 is pre-embedded in the column wall 21 at the position corresponding to the vertical limb 52. The vertical limb 52 has a bolt hole, which corresponds to the opening of the sleeve 53 and is anchored by a detachable anchor bolt 6. The horizontal limb 51 supports the bottom surface of the horizontal plate 311.

[0050] See also Figure 6 As shown, a pressing groove 313 is provided on the bottom surface of the inner edge of the horizontal plate body 311. The length of the pressing groove 313 is equal to the length of the horizontal limb 51. The pressing groove 313 is clamped on the horizontal limb 51. A chamfer 314 is provided on the top surface of the inner edge of the horizontal plate body 311.

[0051] The construction method of the node structure of the precast concrete cavity column and the precast composite column cap is as follows:

[0052] Step 1: determine the position of the precast concrete cavity column 2 on the surface of the lower floor 1 and measure and lay out the lines.

[0053] Step 2: Install the cap bottom corbel support 5 on all four sides of the precast concrete cavity column 2, and use anchor bolts 5 to threadably fasten the vertical limbs 52 of the cap bottom corbel support 5 to the sleeves 53 reserved in the column body of the precast concrete cavity column 2 to support the prefabricated part 31 of the prefabricated composite column cap 3.

[0054] Step three, water the mortar area at the bottom of the precast concrete cavity column 2 to make it wet, use the mortar to mortar the entire bottom of the column. The mortar height should be 1 cm higher than the joint height, and use a trowel to trim it. The middle should be high and the surroundings should be low. The low point should not be lower than the joint height. If it is found that there is a part on the edge of the component where the mortar has not overflowed during the adjustment of the verticality, lift it immediately, add mortar to the missing part, and re-trim the slope.

[0055] Step 4: Place a rubber tire or two layers of 10mm x 10mm wooden planks at the base of the precast concrete column 2, and pad the top with soft gaskets. At the same time, tie a traction rope approximately 1 meter from the column base. If the precast concrete column 2 shakes after flipping, pull the traction rope to maintain balance. Then, use the tower crane to flip the column and lift it using the pre-installed lifting rings. Before lifting, the quality manager will verify the number and dimensions of the precast concrete column 2. Once the quality is verified, a dedicated person will be responsible for hooking the column. Once the hooking personnel have evacuated to a safe area, the signalman below will confirm the safety of the component and direct the lifting to proceed slowly. When the column is approximately 500mm above the ground, the tower crane will confirm safety and resume lifting. Once the precast column structure is lowered to 500mm from the foundation structure, fine-tune it according to the control line. Once fine-tuning is complete, the lowering process will be slowed down. Two professional operators will manually guide the lowering process. When the column is 100mm below the foundation, one worker will use a plumb line to check that the column's edge is aligned with the horizontal positioning line. After the precast concrete cavity column 2 is in place, a level is used to check the elevation, and each column must be checked after it is hoisted.

[0056] Step 5: Set up the vertical scaffolding support 4 and the plate seam position template below the prefabricated part 31.

[0057] Step 6: Hoisting and installing the prefabricated part 31:

[0058] Before hoisting, the quality manager will check the number and size of the prefabricated part 31. After the quality is verified, a dedicated person will be responsible for hooking. After the hooking personnel have evacuated to a safe area, the signalman below will confirm the safety of the component and command the slow hoisting. When the hoist is about 500mm above the ground, the tower crane will confirm that it is safe and continue hoisting. After the prefabricated part 31 is hoisted above the precast concrete cavity column 2, the traction rope is pulled to fine-tune the position of the prefabricated part 31 so that the center of the prefabricated part 31 is aligned with the precast concrete cavity column 2 to prevent the two components from colliding and falling. After the fine-tuning is completed, the lowering is slowed down until it falls on the vertical scaffolding support 4 at the bottom of the cap. The prefabricated part 31 is aligned with the position of the bite key slot 23. The elevation and levelness are promptly checked.

[0059] Step seven: tie the steel bars within the cast-in-place portion 32, and then cast the cast-in-place concrete in one piece.

[0060] See also Figure 8As shown, this embodiment can be used in combination with a cast-in-place floor slab, that is, a cast-in-place floor slab scaffolding support frame 10 connected to the vertical scaffolding support at the bottom of the cap is provided on the outside thereof, and the cast-in-place floor slab main purlin 13, cast-in-place floor slab secondary purlin 12 and cast-in-place floor slab bottom formwork 11 are erected layer by layer on the cast-in-place floor slab scaffolding support frame 10, and then the cast-in-place floor slab concrete 9 and the cast-in-place part 32 are cast integrally, meaning that when the cast-in-place floor slab bottom formwork 11 is erected, it needs to be flush with the top surface of the prefabricated part 31 and be tightly connected.

Claims

1. A precast concrete cavity column and precast composite column cap combined connection node structure, characterized by: It includes a lower floor (1), precast concrete cavity columns (2), precast composite column caps (3) and a support system. The precast concrete cavity column (2) includes a column wall (21) and a central column hole (22). An engaging keyway (23) is provided in the middle of the column wall (21). The engaging keyway (23) is wavy and has a trapezoidal cross section. The column wall (21) corresponding to the setting range of the engaging keyway (23) becomes thicker toward the central column hole (22). The prefabricated composite column cap (3) includes a prefabricated portion (31) and a cast-in-place portion (32). The middle portion of the prefabricated portion (31) is provided with a sleeve (36) adapted to the shape of the column wall. The sleeve (36) is sleeved on the outer surface of the column wall (21) and engages with the keyway (23). The concrete of the prefabricated part (31) includes a horizontal plate body (311) and an annular thickened portion (312) at the outer edge of the plate. A plate edge ring beam (7) is provided at the position of the annular thickened portion (312) at the outer edge of the plate. The cast-in-place part (32) is arranged on the upper side of the prefabricated part (31), and the concrete of the cast-in-place part (32) is engaged with the engaging keyway (23). The support system includes a bottom vertical scaffolding support (4) and a bottom corbel support (5), wherein the bottom of the bottom vertical scaffolding support (4) stands on the lower floor (1), the top of the bottom vertical scaffolding support (4) is supported at the center of the prefabricated part (31), and the bottom corbel support (5) is fixedly connected to the inner corner formed by the column wall (21) and the horizontal plate body (311) and supported on the bottom surface of the horizontal plate body (311).

2. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 1 is characterized in that: The cap bottom bracket support (5) is a section of angle steel, which is arranged on four sides of the column wall (21). The angle steel opening faces outward and includes a horizontal limb (51), a vertical limb (52) and a reinforcing plate (54). The reinforcing plate (54) is fixedly connected between the horizontal limb (51) and the vertical limb (52). The vertical limb (52) is close to the surface of the column wall (21). A horizontal sleeve (53) is pre-embedded on the column wall (21) at the position corresponding to the vertical limb (52). Bolt holes are opened on the vertical limb (52). The bolt holes correspond to the openings of the sleeve (53) and are anchored by detachable anchor bolts (6). The horizontal limb (51) supports the bottom surface of the horizontal plate body (311).

3. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 2 is characterized in that: A pressing groove (313) is provided on the bottom surface of the inner edge of the horizontal plate body (311). The length of the pressing groove (313) is equal to the length of the horizontal limb (51). The pressing groove (313) is clamped on the horizontal limb (51). A chamfer (314) is provided on the top surface of the inner edge of the horizontal plate body (311).

4. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 1 is characterized in that: The reinforcement of the prefabricated composite column cap (3) includes a cap bottom longitudinal reinforcement (33), a cap top longitudinal reinforcement (34) and a cap body stirrup (35), wherein the cap bottom longitudinal reinforcement (33) is located in the prefabricated portion (31), the cap top longitudinal reinforcement (34) is located in the cast-in-place portion (32), the top of the cap body stirrup (35) is connected to the cap top longitudinal reinforcement (34), and the bottom of the cap body stirrup (35) is connected to the cap bottom longitudinal reinforcement (33).

5. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 4 is characterized in that: The cap body stirrup (35) is an open type stirrup, which is composed of a U-shaped reinforcement (351) and a top cover reinforcement (352). The U-shaped reinforcement (351) is located in the horizontal plate body (311), and the ends of the two limbs of the U-shaped reinforcement (351) are fixedly connected to the two ends of the top cover reinforcement (352).

6. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 5, characterized in that: The top end of the outer leg of the U-shaped reinforcement (351) is curled at the annular thickening portion (312) at the outer edge of the plate to form a plate edge ring beam stirrup (71), and the plate edge ring beam stirrup (71) encloses the plate edge top longitudinal reinforcement (72), plate edge waist longitudinal reinforcement (73) and plate edge bottom longitudinal reinforcement (74) of the plate edge ring beam (7), wherein the plate edge waist longitudinal reinforcement (73) and the plate edge bottom longitudinal reinforcement (74) are located at the annular thickening portion (312) at the outer edge of the plate, and the plate edge top longitudinal reinforcement (72) is located at the cast-in-place portion (32).

7. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 5, characterized in that: The top end of the inner limb of the U-shaped reinforcement (351) is provided with an inwardly bent hook (353), and the inner top longitudinal reinforcement (354) of the plate is provided in the hook (353).

8. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 5, characterized in that: The cap bottom longitudinal rib (33) is located on the upper side of the U-shaped rib (351), and the cap top longitudinal rib (34) is located on the upper side of the top cover rib (352).

9. The precast concrete cavity column and precast composite column cap combined connection node structure according to claim 5, characterized in that: A cap ring beam (8) is further provided in the prefabricated composite column cap (3). The reinforcement of the cap ring beam (8) includes a cap bottom longitudinal reinforcement (81), a cap top longitudinal reinforcement (82) and a cap stirrup (83). The cap bottom longitudinal reinforcement (81) is located in the horizontal plate body (311), the cap top longitudinal reinforcement (82) is located on the lower side of the top cover reinforcement (352), and the cap stirrup (83) is enclosed on the outer sides of the cap bottom longitudinal reinforcement (81) and the cap top longitudinal reinforcement (82).

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