Pouring-free PEC column vertical connecting structure

Abstract

The invention relates to a pouring-free PEC column vertical connecting structure which comprises an upper PEC column and a lower PEC column, a tenon and a first plug-in unit are arranged on the butt joint face of the upper PEC column, a groove and a second plug-in unit are arranged on the butt joint face of the lower PEC column, a connecting steel plate is further embedded in the outer surface of concrete of the lower PEC column, and when the upper PEC column and the lower PEC column are in vertical butt joint, the tenon and the first plug-in unit are connected in a staggered mode. The tenon is embedded into the groove for positioning, the position is fixed through opposite insertion of the first opposite insertion piece and the second opposite insertion piece, the step of additionally arranging a temporary fixing and supporting structure is omitted, the concrete surfaces of the upper PEC column and the lower PEC column are connected together through the connecting steel plate and bolts, vertical continuity of pre-cast concrete of the upper PEC column and the lower PEC column is achieved, and the construction efficiency is improved. And the force transmission effect is ensured to be better, concrete pouring at the connecting position on site is also omitted, the assembly efficiency is improved, labor and materials are saved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of prefabricated buildings, and in particular to a casting-free PEC column vertical connection structure. Background Art

[0002] The PEC column is a partially covered steel-concrete column with an H-shaped steel as the internal skeleton, and stirrups are arranged on both sides of the web of the H-shaped steel and poured with concrete. When the PEC columns are vertically connected, the prior art usually leaves a certain height at the connection end of the upper and lower PEC columns and does not pre-cast concrete in the factory. Instead, the webs of the upper and lower PEC columns are connected together using connecting steel plates and bolts at the construction site, and then concrete is poured into the cavity at the connection end on site. This connection structure has cumbersome procedures and is time-consuming, and the construction quality is not easy to guarantee. In addition, the post-cast concrete at the connection end of the upper and lower PEC columns usually leaves a protruding gate that needs to be cut off later, which not only wastes materials, but also affects the appearance and increases working hours. In the prior art, in order to facilitate the connection and positioning of the upper and lower PEC columns, ear plates are usually set on the flanges of the connecting ends of the upper and lower PEC columns. After the upper and lower PEC columns are connected up and down, the ear plates of the upper and lower PEC columns are first fixed with bolts through the connecting plates to play a temporary fixing role. After the vertical connection of the upper and lower PEC columns is completed, the ear plates are removed, resulting in a large construction workload and a waste of materials. Summary of the invention

[0003] The invention discloses a cast-free PEC column vertical connection structure, wherein the connection ends of the upper and lower PEC columns do not require casting, and no temporary fixing measures are required when the upper and lower PEC columns are butt-jointed, and the structure has the technical advantages of efficient and fast construction, material saving, construction period saving, and cost reduction.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A cast-free PEC column vertical connection structure comprises an upper PEC column and a lower PEC column, wherein the upper PEC column comprises an upper PEC column flange, an upper PEC column web and upper PEC column concrete, and the lower PEC column comprises a lower PEC column flange, a lower PEC column web and lower PEC column concrete, wherein the end face of the upper PEC column flange at the connection end is longer than the end face of the upper PEC column web, a tenon perpendicular to the upper PEC column web is formed on the bottom face of the upper PEC column concrete, the bottom face of the tenon is flush with the end face of the upper PEC column flange, the bottom faces of the upper PEC column concrete on both sides of the tenon are lower than the end face of the upper PEC column flange, a first pair of plug-ins are embedded on the bottom face of the upper PEC column concrete on both sides of the tenon, bolt holes are provided on the outer side faces of the upper PEC column concrete on both sides of the upper PEC column web; a groove perpendicular to the lower PEC column web is formed on the top face of the lower PEC column concrete, the bottom face of the groove is flush with the top face of the lower PEC column flange, the bottom faces of the groove on both sides of the groove are flush with the end face of the upper PEC column flange, the bottom faces of the upper PEC column concrete on both sides of the tenon ... The top surface of the PEC column concrete is higher than the top surface of the flange of the lower PEC column. A second pair of plug-ins are buried in the top surface of the lower PEC column concrete on both sides of the groove. The edges of the lower PEC column concrete on both sides of the lower PEC column web are respectively provided with connecting steel plates. The connecting steel plates include vertical plates and horizontal plates. The vertical plates are flush with the outer side surface of the lower PEC column concrete. One end of the horizontal plate is connected to the vertical plate, and the other end of the horizontal plate is welded to the web of the lower PEC column. The horizontal plate is buried in the concrete of the lower PEC column. Bolt holes are opened in the connecting steel plates, and the vertical plates of the connecting steel plates exceed the top surface of the lower PEC column concrete. The lower end of the upper PEC column is vertically connected to the upper end of the lower PEC column, and the convex tenon is embedded in the groove. The first pair of plug-ins and the second pair of plug-ins are inserted and fixed to each other. The vertical plate of the connecting steel plate fits the outer side surface of the upper PEC column concrete. The vertical plate is fixed to the outer side surface of the upper PEC column concrete by bolts. The upper PEC column flange is welded and fixed to the lower PEC column flange.

[0005] Furthermore, the area on the outer side of the upper PEC column concrete where the threaded hole is opened is concave relative to the outer side of the upper PEC column concrete above the area where the threaded hole is located.

[0006] Furthermore, two horizontal plates are arranged at intervals in the upper and lower parts, the same end of the two horizontal plates is fixedly connected to the vertical plate, the other ends of the two horizontal plates are welded and fixed to the web of the lower PEC column, and the space between the two horizontal plates is filled and covered with the concrete of the lower PEC column.

[0007] Furthermore, stirrups and longitudinal steel bars are respectively provided on both sides of the web of the upper PEC column and the web of the lower PEC column, one end of the first pair of plug-ins is connected to the longitudinal steel bars of the upper PEC column, and the other end of the first pair of plug-ins extends out of the bottom surface of the upper PEC column concrete on both sides of the tenon; one end of the second pair of plug-ins is connected to the longitudinal steel bars of the lower PEC column, and the other end is flush with the top surface of the lower PEC column concrete on both sides of the groove.

[0008] Further, the first pair of plugs includes a first sleeve and a plug, the upper and lower ends of the first sleeve are open, the first sleeve is buried in the concrete of the upper PEC column, the longitudinal steel bars of the upper PEC column are inserted into the first sleeve, the ends of the longitudinal steel bars of the upper PEC column are provided with a first pier head, the lower part of the first pier head is provided with a plug, one end of the plug is embedded in the first sleeve, and the other end of the plug extends out of the first sleeve; The second pair of plug-ins includes a second sleeve and an elastic clip. The upper and lower ends of the second sleeve are open. The second sleeve is buried in the concrete of the lower PEC column. The longitudinal steel bars of the lower PEC column are inserted into the second sleeve. A second pier head is provided at the end of the longitudinal steel bars of the lower PEC column. An elastic clip is provided at the upper part of the second pier head. The elastic clip is fixed on the second sleeve. The plug passes through the elastic clip and is inserted into the second sleeve.

[0009] Furthermore, the diameter of the first pier head is greater than the diameter of the longitudinal steel bars of the upper PEC column, the diameter of the second pier head is greater than the diameter of the longitudinal steel bars of the lower PEC column, a retractable first rivet is provided on the outer wall of the longitudinal steel bars of the upper PEC column extending into the first sleeve, and a retractable second rivet is provided on the outer wall of the longitudinal steel bars of the lower PEC column extending into the second sleeve.

[0010] Furthermore, the first sleeve and the second sleeve are both filled with anti-corrosion sealing materials.

[0011] Furthermore, the plug is divided into a fixing part, an insertion rod and a locking head from top to bottom. The width of the fixing part is greater than that of the insertion rod. The fixing part is embedded in the first sleeve and fixed. The insertion rod and the locking head are located outside the first sleeve. The lower outer circumference of the fixing part extends horizontally outward to form a first limiting part. The connection between the fixing part and the insertion rod forms a second limiting part. The connection between the insertion rod and the locking head extends horizontally outward along the outer circumference to form a third limiting part. The bottom end of the first sleeve abuts against the first limiting part. After the first pair of plug-ins and the second pair of plug-ins are inserted into each other, the second limiting part presses the top end of the elastic clip, and the bottom end of the elastic clip abuts against the third limiting part. The insertion rod is inserted into the elastic clip, and the locking head passes through the elastic clip. Epoxy resin is applied on the contact surface between the second limiting part and the elastic clip.

[0012] The present invention improves the structure of the connection ends of the upper and lower PEC columns, so that the precast concrete after the upper and lower PECs are connected is continuous from top to bottom, thereby ensuring a good force transmission effect; by pre-installing a connecting steel plate on the concrete side of the lower PEC column, a bolt hole is opened on the concrete side of the upper PEC column, and the upper PEC column and the lower PEC column after the connection are fixedly connected by the connecting steel plate and the bolts, thereby eliminating the step of pouring concrete on site at the connection point in the prior art, reducing on-site wet operations, and the arrangement of the connecting steel plate on the concrete surface can also reduce the risk of structural instability; in addition, the present invention also realizes the positioning of the upper and lower PEC columns when connected by the mutual cooperation of a first pair of plug-ins and tenons pre-arranged on the upper PEC column and a second pair of plug-ins and grooves pre-arranged on the lower PEC column, without the need to additionally arrange an ear plate, so that the connection between the columns is simpler, more efficient and faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the upper PEC column in the embodiment; Figure 2 It is a schematic diagram of the structure of the lower PEC column in the embodiment; Figure 3 It is a schematic diagram of the vertical connection nodes of the upper and lower PEC columns; Figure 4 is the vertical section of the lower PEC column; Figure 5 It is the vertical section diagram of the vertical connection node of the upper and lower PEC columns; Figure 6 for Figure 5 The enlarged view of point A in the middle; Figure 7 It is a schematic diagram of the structure of the first pair of plug-ins on the upper PEC column; Figure 8 Schematic diagram of the structure of the second pair of plug-ins on the lower PEC column.

[0014] Reference numerals: 1. Upper PEC column flange; 2. Upper PEC column web; 3. Upper PEC column concrete; 4. Tenon; 5. Bolt hole; 6. First pair of plug-ins; 61. First sleeve; 62. First rivet; 63. Plug; 631. Fixing part; 632. Insertion rod; 633. Locking head; 634. First limiting part; 635. Second limiting part; 636. Third limiting part; 64. First pier head; 7. Lower PEC column flange; 8. Lower PEC column web; 9. Lower PEC column concrete; 10. Connecting steel plate; 11. Groove; 12. Bolt; 13. Second pair of plug-ins; 131. Second sleeve; 132. Elastic clip; 133. Second pier head; 134. Second rivet; 14. Interface between upper and lower PEC columns; 15. Lower PEC column longitudinal reinforcement; 16. Upper PEC column longitudinal reinforcement; 17. Epoxy resin; 18. Anti-corrosion sealing material. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] This embodiment discloses a vertical connection structure of a PEC column, including an upper PEC column and a lower PEC column, wherein the bottom end of the upper PEC column is fixedly connected to the top end of the lower PEC column to form a vertical connection node, and the upper PEC column and the lower PEC column both include H-shaped steel and concrete filled on both sides of the H-shaped steel web. Figure 1 As shown, for the convenience of structural display, Figure 1 Place the bottom connection end of the upper PEC column upwards. Figure 1 The direction shown is for reference only, and introduces the structural setting of the upper PEC column connection end. Figure 1 The left and right sides of the upper PEC column are the upper PEC column flanges 1, the upper PEC column webs 2 are connected to the upper PEC column flanges 1 at both ends, and the upper PEC column concrete 3 is located on both sides of the upper PEC column webs 2. When forming the upper PEC column concrete 3, Figure 1The top surface of the upper PEC column concrete 3 near the upper PEC column flanges 1 at both ends is lower than the top surface of the upper PEC column flanges 1, and a tenon 4 is formed in the middle, the top surface of the tenon 4 is flush with the top surface of the upper PEC column flanges 1, and the length direction of the tenon 4 is perpendicular to the upper PEC column web 2. In the upper PEC column concrete 3 on each side of the upper PEC column web 2, the thickness of the upper PEC column concrete 3 within a height range close to the tenon 4 is relatively thin, and the thinner area is used to embed the connecting steel plate 10 when connecting with the lower PEC column later, so that the outer surface of the connecting steel plate 10 can be flush with the overall outer surface of the upper PEC column concrete 3. A plurality of bolt holes 5 are arranged at intervals in the area where the upper PEC column concrete 3 with a thinner thickness on each side is located. The tenon 4 is arranged along the entire thickness direction of the upper PEC column concrete 3, and is located in the middle of the upper PEC column flanges 1 at both ends. A first pair of plug-ins 6 is pre-embedded in the upper PEC column concrete 3 on both sides of the tenon 4, and a first pair of plug-ins 6 is arranged on the upper PEC column concrete 3 on both sides of the upper PEC column web 2, the lower parts of the first pair of plug-ins 6 are embedded in the upper PEC column concrete 3, and the upper parts of the first pair of plug-ins 6 are exposed.

[0017] The structure of the lower PEC column is as follows Figure 2 As shown, Figure 2 The lower PEC column flange 7 is located at the front and rear ends, the lower PEC column web 8 is vertically connected to the two lower PEC column flanges 7, and the lower PEC column concrete 9 is filled on both sides of the lower PEC column web 8 at the left and right ends. Connecting steel plates 10 are respectively set on the lower PEC column concrete 9 on the left and right sides. The connecting steel plates 10 are formed by connecting a vertical plate and a horizontal plate. The vertical plate is flush with the outer wall of the lower PEC column concrete 9. The horizontal plate can be set in one layer or multiple layers with upper and lower intervals. The attached figure of this embodiment takes the setting of two layers of horizontal plates with upper and lower intervals as an example. One end of the two layers of horizontal plates are welded to the vertical plate, and the other end of the two layers of horizontal plates are vertically welded to the lower PEC column web 8. The horizontal plates of the connecting steel plates 10 are buried in the lower PEC column concrete 9, and bolt holes are arranged at intervals on the vertical plates of the connecting steel plates 10. When the lower PEC column concrete 9 is formed, the top surface of the lower PEC column concrete 9 located in the middle of the lower PEC column flanges 7 at both ends is flush with the top surface of the lower PEC column flanges 7, and the top surface of the lower PEC column concrete 9 close to the lower PEC column flanges 7 at both ends is higher than the lower PEC column flanges 7, thereby forming a groove 11 in the middle of the lower PEC column flanges 7 at both ends, the length direction of the groove 11 is perpendicular to the lower PEC column web 8, and the groove 11 is also set along the entire thickness direction of the lower PEC column concrete 9 of the lower PEC column. The top surface of the connecting steel plate 10 is higher than the highest top surface of the lower PEC column concrete 9, and a second pair of plug-ins 13 are pre-embedded in the lower PEC column concrete 9 on both sides of the groove 11. The second pair of plug-ins 13 are distributed on both sides of the lower PEC column web 8, and the second pair of plug-ins 13 are used to plug with the first pair of plug-ins 6.

[0018] like Figure 5 As shown, upper PEC column longitudinal steel bars 16 and stirrups are respectively provided on both sides of the upper PEC column web 2. Similarly, lower PEC column longitudinal steel bars 15 and stirrups are provided on both sides of the lower PEC column web 8. The embedded ends of the first pair of plug-ins 6 are fixedly connected to the upper PEC column longitudinal steel bars 16, and the second pair of plug-ins 13 are fixedly connected to the lower PEC column longitudinal steel bars 15.

[0019] The structure of the first pair of plug-ins 6 is as follows: Figure 7 As shown, the first pair of plugs 6 include a first sleeve 61 and a plug 63. The upper and lower ends of the first sleeve 61 are open, and the lower end of the first sleeve 61 is open larger than the upper end. The first sleeve 61 is completely buried in the upper PEC column concrete 3. The bottom end of the upper PEC column longitudinal steel bar 16 is inserted into the first sleeve 61, and a first pier head 64 is arranged at the bottom end of the upper PEC column longitudinal steel bar 16. The diameter of the first pier head 64 is larger than the diameter of the upper PEC column longitudinal steel bar 16. A retractable first rivet 62 is arranged on the outer wall of the upper PEC column longitudinal steel bar 16 extending into the first sleeve 61. Both the first pier head 64 and the first rivet 62 can play an anti-pullout role. A plug 63 is provided in the first sleeve 61 at the lower part of the first pier 64. The plug 63 is divided into a fixing portion 631, an insert rod 632 and a locking head 633 from top to bottom. The width of the fixing portion 631 is greater than the width of the insert rod 632. The fixing portion 631 is embedded in the first sleeve 61 and fixed. The insert rod 632 and the locking head 633 both extend out of the first sleeve 61. The fixing portion 631 extends horizontally outward on the outer circumference of the lower part to form a first limiting portion 634. The diameter of the insert rod 632 gradually decreases from top to bottom. The connection between the fixing portion 631 and the insert rod 632 forms a second limiting portion 635. The bottom end of the first sleeve 61 abuts against the first limiting portion 634. The connection between the insert rod 632 and the locking head 633 extends horizontally outward along the outer circumference to form a third limiting portion 636. The diameter of the locking head 633 gradually decreases from top to bottom to form a truncated cone structure.

[0020] The structure of the second pair of plug-ins 13 is as follows Figure 8As shown, the second pair of plug-ins 13 includes a second sleeve 131 and an elastic clip 132. The upper and lower ends of the second sleeve 131 are open, and the upper end is open larger than the lower end. The second sleeve 131 is completely buried in the lower PEC column concrete 9. The top of the lower PEC column longitudinal steel bar 15 is inserted into the second sleeve 131, and a second pier 133 is set at the top of the lower PEC column longitudinal steel bar 15. The diameter of the second pier 133 is larger than the diameter of the lower PEC column longitudinal steel bar 15. A retractable second rivet 134 is provided on the outer wall of the lower PEC column longitudinal steel bar 15 extending into the second sleeve 131. The second pier 133 and the second rivet 134 also play an anti-pullout role. An elastic clip 132 is provided in the second sleeve 131 at the upper part of the second pier 133. The elastic clip 132 is a hollow cylindrical structure with open upper and lower ends and has elastic deformation ability. The top of the elastic clip 132 is fixed on the second sleeve 131.

[0021] When the upper PEC column and the lower PEC column are vertically connected, the first pair of plug-ins 6 and the second pair of plug-ins 13 are plugged into each other. Figure 6 As shown, the insertion rod 632 and the locking head 633 of the first pair of plug-ins 6 are inserted into the second pair of plug-ins 13, and the elastic clamp 132 begins to expand outward, so that the locking head 633 passes through the inner cavity of the elastic clamp 132 and extends to the outside. The elastic clamp 132 automatically resets and clamps the locking head 633, and the bottom end of the elastic clamp 132 is clamped at the third limit portion 636. Before the first pair of plug-ins 6 and the second pair of plug-ins 13 are plugged in, the surface of the second limit portion 635 of the first pair of plug-ins 6 is coated with epoxy resin 17, and the top surface of the elastic clamp 132 of the second pair of plug-ins 13 is also coated with epoxy resin 17, so that after the first pair of plug-ins 6 and the second pair of plug-ins 13 are plugged in, the second limit portion 635 is in close contact with the elastic clamp 132, achieving a good sealing effect. In addition, the inner cavity of the first sleeve 61 of the first pair of plug-ins 6 and the inner cavity of the second sleeve 131 of the second pair of plug-ins 13 are filled with anti-corrosion sealing material 18.

[0022] The bottom connection end of the upper PEC column given above is vertically connected with the top connection end of the lower PEC column, such as Figures 4 to 5As shown, the tenon 4 is embedded in the groove 11 to achieve rapid positioning, and the first pair of plug-ins 6 is inserted into the second pair of plug-ins 13 to play an auxiliary fixing role. The vertical plate of the connecting steel plate 10 on the lower PEC column is fitted on the outer surface of the upper PEC column concrete 3 with bolt holes 5, and the bolts 12 are used to pass through the bolt holes on the connecting steel plate 10 and the bolt holes 5 on the upper PEC column concrete 3 in sequence to fix the vertical plate of the connecting steel plate 10 on the upper PEC column concrete 3. At this time, the bottom surface of the tenon 4 is tightly fitted with the bottom surface of the groove 11, and the bottom surface of the upper PEC column concrete 3 on both sides of the tenon 4 is tightly fitted with the top surface of the lower PEC column concrete 9 on both sides of the groove 11 to form the upper and lower PEC column interface 14. After completing the above connection, the connection between the upper PEC flange 1 and the lower PEC column flange 7 is welded and fixed, and no temporary support is required throughout the process.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cast-free PEC column vertical connection structure, comprising an upper PEC column and a lower PEC column, wherein the upper PEC column comprises an upper PEC column flange, an upper PEC column web and upper PEC column concrete, and the lower PEC column comprises a lower PEC column flange, a lower PEC column web and lower PEC column concrete, characterized in that: The end face of the upper PEC column flange at the connection end is longer than the end face of the upper PEC column web, a tenon perpendicular to the upper PEC column web is formed on the bottom face of the upper PEC column concrete, the bottom face of the tenon is flush with the end face of the upper PEC column flange, the bottom faces of the upper PEC column concrete on both sides of the tenon are lower than the end face of the upper PEC column flange, a first pair of plug-ins are buried on the bottom face of the upper PEC column concrete on both sides of the tenon, and bolt holes are opened on the outer sides of the upper PEC column concrete on both sides of the upper PEC column web; a groove perpendicular to the lower PEC column web is formed on the top face of the lower PEC column concrete, the bottom face of the groove is flush with the top face of the lower PEC column flange, the top faces of the lower PEC column concrete on both sides of the groove are higher than the top face of the lower PEC column flange, and a second pair of plug-ins are buried on the top face of the lower PEC column concrete on both sides of the groove. The edges of the lower PEC column concrete on both sides of the lower PEC column web are respectively provided with connecting steel plates, and the connecting steel plates include vertical plates and horizontal plates. The vertical plates are flush with the outer side surface of the lower PEC column concrete, one end of the horizontal plate is connected to the vertical plate, and the other end of the horizontal plate is welded to the lower PEC column web, the horizontal plate is buried in the lower PEC column concrete, bolt holes are opened on the connecting steel plates, and the vertical plates of the connecting steel plates exceed the top surface of the lower PEC column concrete; the lower end of the upper PEC column is vertically connected to the upper end of the lower PEC column, the convex tenon is embedded in the groove, the first pair of plug-ins and the second pair of plug-ins are inserted and fixed to each other, the vertical plate of the connecting steel plate is fitted with the outer side surface of the upper PEC column concrete, the vertical plate is fixed to the outer side surface of the upper PEC column concrete by bolts, and the upper PEC column flange is welded and fixed to the lower PEC column flange.

2. A pouring-free PEC column vertical connection structure according to claim 1, characterized in that: The area on the outer side of the upper PEC column concrete where the threaded hole is opened is concave relative to the outer side of the upper PEC column concrete above the area where the threaded hole is located.

3. The pouring-free PEC column vertical connection structure according to claim 1, characterized in that: Two horizontal plates are arranged at intervals in the upper and lower parts, the same end of the two horizontal plates is fixedly connected to the vertical plate, the other ends of the two horizontal plates are welded and fixed to the web of the lower PEC column, and the space between the two horizontal plates is filled and covered with the concrete of the lower PEC column.

4. The pouring-free PEC column vertical connection structure according to claim 1, characterized in that: Stirrups and longitudinal steel bars are respectively provided on both sides of the web of the upper PEC column and the web of the lower PEC column. One end of the first pair of plug-ins is connected to the longitudinal steel bars of the upper PEC column, and the other end of the first pair of plug-ins extends out of the bottom surface of the upper PEC column concrete on both sides of the tenon; one end of the second pair of plug-ins is connected to the longitudinal steel bars of the lower PEC column, and the other end is flush with the top surface of the lower PEC column concrete on both sides of the groove.

5. A pouring-free PEC column vertical connection structure according to claim 4, characterized in that: The first pair of plugs includes a first sleeve and a plug, the upper and lower ends of the first sleeve are open, the first sleeve is buried in the concrete of the upper PEC column, the longitudinal steel bars of the upper PEC column are inserted into the first sleeve, the ends of the longitudinal steel bars of the upper PEC column are provided with a first pier head, the lower part of the first pier head is provided with a plug, one end of the plug is embedded in the first sleeve, and the other end of the plug extends out of the first sleeve; The second pair of plug-ins includes a second sleeve and an elastic clip. The upper and lower ends of the second sleeve are open. The second sleeve is buried in the concrete of the lower PEC column. The longitudinal steel bars of the lower PEC column are inserted into the second sleeve. A second pier head is provided at the end of the longitudinal steel bars of the lower PEC column. An elastic clip is provided at the upper part of the second pier head. The elastic clip is fixed on the second sleeve. The plug passes through the elastic clip and is inserted into the second sleeve.

6. A pouring-free PEC column vertical connection structure according to claim 5, characterized in that: The diameter of the first pier head is larger than the diameter of the longitudinal reinforcement of the upper PEC column, the diameter of the second pier head is larger than the diameter of the longitudinal reinforcement of the lower PEC column, a retractable first rivet is provided on the outer wall of the longitudinal reinforcement of the upper PEC column extending into the first sleeve, and a retractable second rivet is provided on the outer wall of the longitudinal reinforcement of the lower PEC column extending into the second sleeve.

7. The pouring-free PEC column vertical connection structure according to claim 5, characterized in that: The first sleeve and the second sleeve are both filled with anti-corrosion sealing materials.

8. The pouring-free PEC column vertical connection structure according to claim 5, characterized in that: The plug is divided into a fixing part, an insertion rod and a locking head from top to bottom. The width of the fixing part is greater than that of the insertion rod. The fixing part is embedded in the first sleeve and fixed. The insertion rod and the locking head are located outside the first sleeve. The lower outer circumference of the fixing part extends horizontally outward to form a first limiting part. The connection between the fixing part and the insertion rod forms a second limiting part. The connection between the insertion rod and the locking head extends horizontally outward along the outer circumference to form a third limiting part. The bottom end of the first sleeve abuts against the first limiting part. After the first pair of plug-ins and the second pair of plug-ins are inserted into each other, the second limiting part presses the top end of the elastic clip, and the bottom end of the elastic clip abuts against the third limiting part. The insertion rod is inserted into the elastic clip, and the locking head passes through the elastic clip. Epoxy resin is applied on the contact surface between the second limiting part and the elastic clip.

Images