Vertical connection joint of PEC column

Abstract

The utility model relates to a PEC column vertical connection node, which comprises an upper PEC column and a lower PEC column, the butt joint surface of the upper PEC column is provided with a tenon and a first plug-in unit, the butt joint surface of the lower PEC column is provided with a groove and a second plug-in unit, the concrete outer surface of the lower PEC column is also pre-embedded with a connection steel plate, 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 in butt joint. 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 utility model relates to the field of fabricated building, concretely relates to a vertical connecting joint of PEC column. BACKGROUND

[0002] PEC column is a kind of partially coated steel-concrete column, and H-shaped steel is used as internal framework, and stirrup is arranged on the both sides of the web of H-shaped steel, and concrete is formed by pouring.The vertical connection between PEC columns, in the prior art, usually leaves a height at the connecting end of upper and lower PEC columns and does not pre-pour concrete in the factory, but uses connecting steel plate and bolts to connect the webs of upper and lower PEC columns at the construction site, and then pours concrete in the cavity of the connecting end on site.This connection structure is complicated in process and time-consuming, and the construction quality is not easy to guarantee.In addition, the connecting end of upper and lower PEC columns usually leaves a protruding pouring gate that needs to be cut off later, which not only wastes materials, but also affects the appearance and increases the working hours.In the prior art, it is convenient to position the upper and lower PEC columns, and usually ears are arranged on the flanges of the connecting end of upper and lower PEC columns, and the ears of upper and lower PEC columns are fixed by bolts through the connecting plate after the upper and lower PEC columns are connected, which plays a temporary fixing role, and the ears are cut off after the vertical connection of upper and lower PEC columns is completed, which leads to large construction workload and waste of materials. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a vertical connecting joint of PEC column, and the connecting end of upper and lower PEC columns is exempted from pouring, and no temporary fixing measures are needed when the upper and lower PEC columns are connected, which has the technical advantages of efficient and quick construction, material saving, time saving, cost reduction.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0005] A vertical connecting joint of PEC column, comprising an upper PEC column and a lower PEC column, the upper PEC column comprises an upper PEC column flange, an upper PEC column web and upper PEC column concrete, the bottom end face of the upper PEC column flange at the connecting end is longer than the bottom end face of the upper PEC column web, the bottom surface of the upper PEC column concrete between the upper PEC column flanges at both ends forms a tenon, the bottom surface of the upper PEC column concrete on the both sides of the tenon is provided with a first pair of inserts, and bolt holes are formed on the outer side surface of the upper PEC column concrete on the both sides of the upper PEC column web.

[0006] The lower PEC column comprises a lower PEC column flange, a lower PEC column web and lower PEC column concrete, a groove corresponding to the tenon is formed on the top surface of the lower PEC column concrete between the lower PEC column flanges at both ends, second inserts are arranged on the top surface of the lower PEC column concrete on both sides of the groove, and connecting steel plates are arranged on the edges of the lower PEC column concrete on both sides of the lower PEC column web respectively, the connecting steel plates are perpendicular to the lower PEC column flanges, and bolt holes are formed in the connecting steel plates;

[0007] The lower end of the upper PEC column is vertically connected with the upper end of the lower PEC column, the tenon is embedded in the groove, the first inserts and the second inserts are fixed by being inserted into each other, the connecting steel plates are attached to the outer side surface of the upper PEC column concrete, the connecting steel plates are fixed on the outer side surface of the upper PEC column concrete by using bolts, and the upper PEC column flange is welded and fixed with the lower PEC column flange.

[0008] Further, the bottom surface of the tenon is flush with the bottom end surface of the upper PEC column flange, and the bottom surface of the upper PEC column concrete on both sides of the tenon is lower than the bottom end surface of the upper PEC column flange; the bottom surface of the groove is flush with the top end surface of the lower PEC column flange, and the top surface of the lower PEC column concrete on both sides of the groove is higher than the top end surface of the lower PEC column flange.

[0009] Further, the connecting steel plate comprises a vertical plate and a horizontal plate, the vertical plate is flush with the outer side surface of the lower PEC column concrete, one end of the horizontal plate is connected with the vertical plate, and the other end of the horizontal plate is welded on the lower PEC column web; and the area, in which the outer side surface of the upper PEC column concrete is provided with screw holes, is recessed relative to the upper PEC column concrete outer side surface in the upper area of the area, in which the screw holes are located.

[0010] Further, two horizontal plates are arranged in a spaced-apart manner, one end of each of the two horizontal plates is fixedly connected with the vertical plate, the other end of each of the two horizontal plates is welded and fixed with the lower PEC column web, and the two horizontal plates are filled and covered by the lower PEC column concrete.

[0011] Further, the length direction of the tenon is perpendicular to the upper PEC column web, and the tenon spans the bottom end surface of the upper PEC column concrete on both sides of the upper PEC column web; the length direction of the groove is perpendicular to the lower PEC column web, and the groove spans the top surface of the lower PEC column concrete on both sides of the lower PEC column web.

[0012] Further, the upper PEC column web and the lower PEC column web are respectively provided with stirrups and longitudinal steel bars, one end of the first insert is connected with the upper PEC column longitudinal steel bar, and the other end of the first insert protrudes from the bottom end surface of the upper PEC column concrete on both sides of the tenon; one end of the second insert is connected with the lower PEC column longitudinal steel bar, and the other end is flush with the top surface of the lower PEC column concrete on both sides of the groove.

[0013] Further, the first pair of inserts comprises a first sleeve and a plug, the first sleeve is open at both upper and lower ends, the first sleeve is embedded in the upper PEC column concrete, the upper PEC column longitudinal reinforcement penetrates into the first sleeve, the upper PEC column longitudinal reinforcement end is provided with a first pier head, the lower part of the first pier head is provided with the 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.

[0014] The second pair of inserts comprises a second sleeve and an elastic clamping piece, the second sleeve is open at both upper and lower ends, the second sleeve is embedded in the lower PEC column concrete, the lower PEC column longitudinal reinforcement penetrates into the second sleeve, the lower PEC column longitudinal reinforcement end is provided with a second pier head, the upper part of the second pier head is provided with the elastic clamping piece, the elastic clamping piece is fixed on the second sleeve, the plug penetrates through the elastic clamping piece and is inserted into the second sleeve.

[0015] Further, the diameter of the first pier head is greater than the diameter of the upper PEC column longitudinal reinforcement, the diameter of the second pier head is greater than the diameter of the lower PEC column longitudinal reinforcement, the outer wall of the upper PEC column longitudinal reinforcement extending into the first sleeve is provided with a first telescopic rivet, and the outer wall of the lower PEC column longitudinal reinforcement extending into the second sleeve is provided with a second telescopic rivet.

[0016] Further, the first sleeve and the second sleeve are filled with corrosion-resistant sealing material.

[0017] Further, the plug is divided into a fixed part, a plug rod and a locking head from top to bottom, the width of the fixed part is greater than the width of the plug rod, the fixed part is embedded in the first sleeve, the plug rod and the locking head are located outside the first sleeve, the lower part of the fixed part is outwardly horizontally extended to form a first limiting part, the connection between the fixed part and the plug rod forms a second limiting part, the connection between the plug rod and the locking head is outwardly horizontally extended 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 inserts and the second pair of inserts are inserted into each other, the second limiting part presses the top end of the elastic clamping piece, the bottom end of the elastic clamping piece abuts against the third limiting part, the plug rod is inserted into the elastic clamping piece, the locking head penetrates out of the elastic clamping piece, and the contact surface between the second limiting part and the elastic clamping piece is coated with epoxy resin.

[0018] The utility model discloses a structure improvement is carried out to the connecting end of upper and lower PEC column, makes the upper and lower PEC after butt joint precasted concrete upper and lower through continuous, guarantees good force transmission effect, through the concrete side surface of lower PEC column of preinstallation connection steel sheet, the bolt hole is set up on the concrete side surface of upper PEC column, realizes the fixed connection of upper PEC column and lower PEC column after butt joint through connection steel sheet and bolt, has spared the step of needing in the prior art in situ pouring concrete at the butt joint, reduces the wet operation on site, the setting of connection steel sheet on the concrete surface can also reduce the risk of structural instability, in addition, the utility model discloses still through the first pair of inserts and the tenon of prearranging on upper PEC column, with the second pair of inserts and the recess of prearranging on lower PEC column's intercoordination, realized the positioning when upper and lower PEC column connection, need not extra set up the ear plate, makes the connection of column and column more simple and efficient fast. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structural schematic diagram of upper PEC column in example;

[0020] Figure 2 It is the structural schematic diagram of lower PEC column in example;

[0021] Figure 3 It is the vertical connection node schematic diagram of upper and lower PEC column;

[0022] Figure 4 It is the vertical section view of lower PEC column;

[0023] Figure 5 It is the vertical section view of the vertical connection node of upper and lower PEC column;

[0024] Figure 6 It is Figure 5 It is the enlarged view of A in the middle;

[0025] Figure 7 It is the structural schematic diagram of the first pair of inserts on upper PEC column;

[0026] Figure 8 It is the structural schematic diagram of the second pair of inserts on lower PEC column.

[0027] Reference Signs:

[0028] 1, upper PEC column flange; 2, upper PEC column web; 3, upper PEC column concrete; 4, tenon; 5, bolt hole; 6, first pair of inserts; 61, first sleeve; 62, first rivet; 63, plug; 631, fixed part; 632, insertion rod; 633, locking head; 634, first limiting part; 635, second limiting part; 636, third limiting part; 64, first boss; 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 inserts; 131, second sleeve; 132, elastic clamping piece; 133, second boss; 134, second rivet; 14, upper and lower PEC column interface; 15, lower PEC column longitudinal reinforcement; 16, upper PEC column longitudinal reinforcement; 17, epoxy resin; 18, anticorrosive sealing material. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0030] The embodiment discloses a vertical connecting joint of a PEC column, which comprises an upper PEC column and a lower PEC column, the bottom end of the upper PEC column is fixedly connected with the top end of the lower PEC column, forming a vertical connecting joint, and the upper PEC column and the lower PEC column both comprise an H-shaped steel and concrete filled on both sides of the web of the H-shaped steel. Figure 1 As shown in the figure, the structure of the upper PEC column is shown in the figure for the convenience of structure display, Figure 1 The bottom connecting end of the upper PEC column is placed upwards in the embodiment, so that the upper PEC column is connected with the lower PEC column in the direction shown in the figure. Figure 1 The structure of the connecting end of the upper PEC column is introduced with reference to the direction shown in the figure. Figure 1 The left and right sides of the upper PEC column are upper PEC column flanges 1, the upper PEC column web 2 is connected between the two ends of the upper PEC column flange 1, and the upper PEC column concrete 3 is located on both sides of the upper PEC column web 2. When the upper PEC column concrete 3 is formed, the upper PEC column flange 1 and the upper PEC column web 2 are filled with the upper PEC column concrete 3. Figure 1The top surface of the upper PEC column concrete 3 near the upper PEC column flange 1 is lower than the top surface of the upper PEC column flange 1, and a tenon 4 is formed in the middle part, the top surface of the tenon 4 is flush with the top surface of the upper PEC column flange 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 upper PEC column concrete 3 in the height range near the tenon 4 is relatively thin, and the area with thinner thickness is used for embedding the connecting steel plate 10 when connected 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. Multiple bolt holes 5 are arranged at intervals in the area where the upper PEC column concrete 3 on each side is thinner. The tenon 4 is arranged along the entire thickness direction of the upper PEC column concrete 3 of the upper PEC column, and is located in the middle of the upper PEC column flange 1 at both ends. The first pair of inserts 6 are embedded in the upper PEC column concrete 3 on both sides of the upper PEC column web 2, and the first pair of inserts 6 are arranged on the upper PEC column concrete 3 on both sides of the upper PEC column web 2, the lower part of the first pair of inserts 6 is embedded in the upper PEC column concrete 3, and the upper part of the first pair of inserts 6 is exposed.

[0031] The structure of the lower PEC column is shown in Figure 2 Figure 2 The lower PEC column flange 7 is located in the middle of the front and rear ends, the lower PEC column web 8 is vertically connected between 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. The connecting steel plate 10 is arranged on the lower PEC column concrete 9 on both sides, the connecting steel plate 10 is connected by a vertical plate and a horizontal plate, the vertical plate is flush with the outer side wall of the lower PEC column concrete 9, and the horizontal plate can be arranged in one layer or multiple layers spaced apart, for example, two layers of horizontal plates are arranged in the embodiment, one end of the two layers of horizontal plates is welded to the vertical plate, the other end of the two layers of horizontal plates is vertically welded to the lower PEC column web 8, and the horizontal plate of the connecting steel plate 10 is embedded in the lower PEC column concrete 9, and the vertical plate of the connecting steel plate 10 is provided with bolt holes. 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 flange 7 is flush with the top surface of the lower PEC column flange 7, and the top surface of the lower PEC column concrete 9 near the lower PEC column flange 7 is higher than the lower PEC column flange 7, so that a groove 11 is formed in the middle of the lower PEC column flange 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 arranged 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, the second pair of inserts 13 are embedded in the lower PEC column concrete 9 on both sides of the groove 11, the second pair of inserts 13 are distributed on both sides of the lower PEC column web 8, and the second pair of inserts 13 are used for inserting with the first pair of inserts 6. ​

[0032] As Figure 5 shown, the upper PEC column web plate 2 is provided with upper PEC column longitudinal reinforcement 16 and stirrup on both sides, and the lower PEC column web plate 8 is provided with lower PEC column longitudinal reinforcement 15 and stirrup on both sides. The embedded end of the first pair of inserts 6 is fixedly connected with the upper PEC column longitudinal reinforcement 16, and the second pair of inserts 13 is fixedly connected with the lower PEC column longitudinal reinforcement 15.

[0033] The structure of the first pair of inserts 6 is shown in Figure 7 The first pair of inserts 6 includes a first sleeve 61 and a plug 63. The upper and lower ends of the first sleeve 61 are open. The lower end of the first sleeve 61 is open larger than the upper end. The first sleeve 61 is completely embedded in the upper PEC column concrete 3. The bottom end of the upper PEC column longitudinal reinforcement 16 penetrates into the first sleeve 61, and a first stub 64 is arranged at the bottom end of the upper PEC column longitudinal reinforcement 16. The diameter of the first stub 64 is larger than the diameter of the upper PEC column longitudinal reinforcement 16. The outer wall of the upper PEC column longitudinal reinforcement 16 extending into the first sleeve 61 is provided with a first rivet 62 which can be extended and retracted. The first stub 64 and the first rivet 62 can both play a role in anti-pulling. The plug 63 is arranged at the lower part of the first stub 64 in the first sleeve 61. The plug 63 is divided into a fixed part 631, a plug rod 632 and a locking head 633 from top to bottom. The width of the fixed part 631 is larger than the width of the plug rod 632. The fixed part 631 is embedded in the first sleeve 61 and fixed. The plug rod 632 and the locking head 633 both extend out of the first sleeve 61. The lower part of the outer circumference of the fixed part 631 extends outwardly and horizontally to form a first limiting part 634. The diameter of the plug rod 632 gradually decreases from top to bottom. The connection between the fixed part 631 and the plug rod 632 forms a second limiting part 635. The bottom end of the first sleeve 61 abuts against the first limiting part 634. The connection between the plug rod 632 and the locking head 633 extends outwardly and horizontally along the outer circumference to form a third limiting part 636. The diameter of the locking head 633 gradually decreases from top to bottom, forming a circular truncated cone structure.

[0034] The structure of the second pair of inserts 13 is shown in Figure 8As shown, the second pair of inserts 13 includes a second sleeve 131 and an elastic clamp 132, the upper and lower ends of the second sleeve 131 are open, the upper end is larger than the lower end, and the second sleeve 131 is completely embedded in the lower PEC column concrete 9. The top of the lower PEC column longitudinal reinforcement 15 penetrates into the second sleeve 131, and a second pier head 133 is arranged at the top end of the lower PEC column longitudinal reinforcement 15, the diameter of the second pier head 133 is larger than that of the lower PEC column longitudinal reinforcement 15, and the outer wall of the lower PEC column longitudinal reinforcement 15 extending into the second sleeve 131 is provided with a second telescopic rivet 134, and the second pier head 133 and the second telescopic rivet 134 also play a role in anti-pulling. The upper part of the second sleeve 131 located at the second pier head 133 is provided with an elastic clamp 132, which is a hollow cylindrical structure with open upper and lower ends, has elastic deformation capability, and the top end of the elastic clamp 132 is fixed on the second sleeve 131.

[0035] When the upper PEC column and the lower PEC column are vertically connected, the first pair of inserts 6 and the second pair of inserts 13 are inserted into each other, as shown in Figure 6 The insertion rod 632 and the locking head 633 of the first pair of inserts 6 are inserted into the second pair of inserts 13, the elastic clamp 132 begins to expand outward, 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 limiting portion 636. Before the first pair of inserts 6 and the second pair of inserts 13 are inserted, epoxy resin 17 is applied to the surface of the second limiting portion 635 of the first pair of inserts 6, and epoxy resin 17 is also applied to the top surface of the elastic clamp 132 of the second pair of inserts 13, so that after the first pair of inserts 6 and the second pair of inserts 13 are inserted, the second limiting portion 635 and the elastic clamp 132 are in close contact, achieving good sealing effect. In addition, the inner cavity of the first sleeve 61 of the first pair of inserts 6 and the inner cavity of the second sleeve 131 of the second pair of inserts 13 are filled with corrosion-resistant sealing material 18.

[0036] The bottom connecting end of the upper PEC column and the top connecting end of the lower PEC column are vertically connected, as shown in Figures 4-5As shown, the tenon 4 is embedded in the groove 11, fast positioning can be realized, the first pair of inserts 6 is inserted into the second pair of inserts 13, auxiliary fixing effect is played, the vertical plate of the connecting steel plate 10 on the lower PEC column is attached to the outer surface of the upper PEC column concrete 3 provided with the bolt hole 5, the bolt 12 is sequentially threaded through the bolt hole on the connecting steel plate 10 and the bolt hole 5 on the upper PEC column concrete 3, the vertical plate of the connecting steel plate 10 is fixed on the upper PEC column concrete 3, at this time, the bottom surface of the tenon 4 is closely attached to the bottom surface of the groove 11, the bottom surface of the upper PEC column concrete 3 on both sides of the tenon 4 is closely attached to 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 the above connection is completed, the upper PEC flange 1 and the lower PEC column flange 7 are welded and fixed at the connecting position, and temporary support is not required throughout the process.

[0037] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A vertical connection joint of PEC columns, comprising an upper PEC column and a lower PEC column, the upper PEC column comprising an upper PEC column flange, an upper PEC column web and upper PEC column concrete, the lower PEC column comprising a lower PEC column flange, a lower PEC column web and lower PEC column concrete, characterized in that: The bottom end face of the upper PEC column flange at the connecting end is longer than the bottom end face of the upper PEC column web, the bottom face of the upper PEC column concrete between the upper PEC column flanges at both ends forms a tenon, the first pair of inserts are arranged on the bottom face of the upper PEC column concrete on both sides of the tenon, and bolt holes are arranged on the outer side face of the upper PEC column web on both sides of the upper PEC column web; the top face of the lower PEC column concrete between the lower PEC column flanges at both ends forms a groove corresponding to the tenon, the second pair of inserts are arranged on the top face of the lower PEC column concrete on both sides of the groove, and the connecting steel plates are respectively arranged on the edges of the lower PEC column concrete on both sides of the lower PEC column web, the connecting steel plates are perpendicular to the lower PEC column flanges, and bolt holes are arranged on the connecting steel plates; the lower end of the upper PEC column is vertically connected to the upper end of the lower PEC column, the tenon is embedded in the groove, the first pair of inserts and the second pair of inserts are fixed by being inserted into each other, the connecting steel plates are attached to the outer side face of the upper PEC column concrete, the connecting steel plates are fixed on the outer side face of the upper PEC column concrete by means of bolts, and the upper PEC column flanges and the lower PEC column flanges are welded and fixed.

2. A vertical connection joint of a PEC column according to claim 1, characterized in that: The bottom face of the tenon is flush with the bottom end face of the upper PEC column flange, and the bottom face of the upper PEC column concrete on both sides of the tenon is lower than the bottom end face of the upper PEC column flange; the bottom face of the groove is flush with the top end face of the lower PEC column flange, and the top face of the lower PEC column concrete on both sides of the groove is higher than the top end face of the lower PEC column flange.

3. The vertical connection joint of a PEC column according to claim 1, characterized in that: The connecting steel plate comprises a vertical plate and a horizontal plate, the vertical plate is flush with the outer side face 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; and the area, on which the threaded holes of the upper PEC column concrete are arranged, is recessed inward relative to the upper PEC column concrete on the upper part of the area, on which the threaded holes are arranged.

4. A vertical connection node of a PEC column according to claim 3, characterized in that: The two horizontal plates are arranged in a spaced-apart manner, the same end of the two horizontal plates is fixedly connected to the vertical plate, the other end of the two horizontal plates is welded to the lower PEC column web, and the two horizontal plates are filled and covered by the lower PEC column concrete.

5. The vertical connection joint of a PEC column according to claim 1, characterized in that: The length direction of the tenon is perpendicular to the upper PEC column web, and the tenon spans the bottom end face of the upper PEC column concrete on both sides of the upper PEC column web; the length direction of the groove is perpendicular to the lower PEC column web, and the groove spans the top face of the lower PEC column concrete on both sides of the lower PEC column web.

6. The vertical connection node of a PEC column according to claim 1, characterized in that: The upper PEC column web and the lower PEC column web are respectively provided with stirrups and longitudinal steel bars, one end of the first pair of inserts is connected to the upper PEC column longitudinal steel bars, and the other end of the first pair of inserts extends out of the bottom end face of the upper PEC column concrete on both sides of the tenon; one end of the second pair of inserts is connected to the lower PEC column longitudinal steel bars, and the other end of the second pair of inserts is flush with the top face of the lower PEC column concrete on both sides of the groove.

7. A vertical connection node of a PEC column according to claim 6, characterized in that: The first pair of inserts comprises a first sleeve and a plug, the upper and lower ends of the first sleeve are both open, the first sleeve is embedded in the upper PEC column concrete, the upper PEC column longitudinal steel bars pass into the first sleeve, the end of the upper PEC column longitudinal steel bars is provided with a first stub, the lower part of the first stub is provided with the 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 inserts comprises a second sleeve and an elastic clamping piece. The upper and lower ends of the second sleeve are open. The second sleeve is embedded in the concrete of the lower PEC column. The longitudinal reinforcement of the lower PEC column penetrates into the second sleeve. The end of the longitudinal reinforcement of the lower PEC column is provided with a second pier head. The upper part of the second pier head is provided with the elastic clamping piece. The elastic clamping piece is fixed on the second sleeve. The plug penetrates through the elastic clamping piece and is inserted into the second sleeve.

8. A vertical connection node of a PEC column according to claim 7, characterized in that: The diameter of the first pier head is greater than the diameter of the longitudinal reinforcement of the upper PEC column. The diameter of the second pier head is greater than the diameter of the longitudinal reinforcement of the lower PEC column. The outer wall of the longitudinal reinforcement of the upper PEC column extending into the first sleeve is provided with a first retractable rivet. The outer wall of the longitudinal reinforcement of the lower PEC column extending into the second sleeve is provided with a second retractable rivet.

9. The vertical connection node of a PEC column according to claim 7, characterized in that: The first sleeve and the second sleeve are filled with anticorrosive sealing material.

10. The vertical connection node of a PEC column according to claim 7, characterized in that: The plug is divided into a fixed part, a plug rod and a locking head from top to bottom. The width of the fixed part is greater than the width of the plug rod. The fixed part is embedded in the first sleeve. The plug rod and the locking head are located outside the first sleeve. The lower part of the fixed part is outwardly horizontally extended to form a first limiting part. The connection between the fixed part and the plug rod forms a second limiting part. The connection between the plug rod and the locking head is outwardly horizontally extended 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 inserts and the second pair of inserts are inserted into each other, the second limiting part presses the top end of the elastic clamping piece. The bottom end of the elastic clamping piece abuts against the third limiting part. The plug rod is inserted into the elastic clamping piece. The locking head penetrates out of the elastic clamping piece. The contact surface between the second limiting part and the elastic clamping piece is coated with epoxy resin.

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