Fabricated concrete building joint and gravity grouting connection process thereof

Abstract

The invention discloses an assembly type concrete building joint which comprises a prefabricated concrete column a and a prefabricated concrete column b. An assembly node is formed at the joint of the upper end of the precast concrete column a and the lower end of the precast concrete column b; a plurality of reinforcing steel bars a extending in the length direction are embedded in the precast concrete column a along the circumferential contour in a surrounding manner; a plurality of reinforcing steel bars b extending in the length direction are embedded in the prefabricated concrete column b along the circumferential contour in a surrounding manner; the upper ends of the reinforcing steel bars a are coaxially and integrally connected with a grouting steel sleeve, and a grouting channel is formed in the grouting steel sleeve; an integrated assembly joint with almost no assembly trace is formed at the joint of the upper end of the prefabricated concrete column a and the lower end of the prefabricated concrete column b, the structure integrity is guaranteed through the assembly structure, and the airtight waterproof performance is also remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings. Background Art

[0002] Prefabricated buildings are characterized by high construction efficiency and standardized production. The mold manufacturing accuracy reaches ±1mm, avoiding defects such as honeycomb and rough surface of cast-in-place structures. At the same time, prefabricated buildings can effectively reduce construction waste: there are fewer wet operations on site, and the amount of waste is reduced by more than 70%. For example, cast-in-place structures generate about 50kg / m 2 Garbage, assembled type only 15kg / m 2 .

[0003] The shortcomings of existing prefabricated concrete columns compared to cast-in-place structures and the weak parts of the structure are often concentrated at the connection nodes of prefabricated concrete columns. If dry connection or general wet connection is adopted, the assembly marks at the joints of the connection nodes of the prefabricated concrete columns are obvious, and the moisture at the joints penetrates into the interior through the joints, corroding the steel bars (especially the connectors at the nodes), causing rust expansion and cracking; concrete accelerates carbonization after being exposed to moisture for a long time, and its strength decreases. In severe cases, it causes structural deformation or even partial collapse; if it is a low-quality node, the low-quality joint will be displaced due to temperature stress, foundation settlement or earthquake action at the node, weakening the overall seismic performance; at the same time, the existing wet connection method requires grouting equipment, which is difficult to implement when the assembly node is at a high place. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a prefabricated concrete building node and a gravity grouting connection process thereof. The connection between the upper end of the precast concrete column a and the lower end of the precast concrete column b of the present invention forms an integrated assembly node with almost no assembly traces. This assembly structure not only ensures the integrity of its structure, but also significantly improves its airtight and waterproof performance.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention provides an assembled concrete building node, comprising a precast concrete column a and a precast concrete column b; the connection between the upper end of the precast concrete column a and the lower end of the precast concrete column b forms an assembly node.

[0006] Several A steel bars extending in the length direction are embedded in the a precast concrete column in an enclosed shape along the circumferential contour; several B steel bars extending in the length direction are embedded in the b precast concrete column in an enclosed shape along the circumferential contour; the upper end of each A steel bar is coaxially connected to a grouting steel sleeve, and the grouting steel sleeve contains a grouting channel; the lower end of each B steel bar has a section exposed, and the embedded and exposed sections of the B steel bar are respectively recorded as the B steel bar embedded section and the B steel bar exposed section; in the assembled state, the B steel bar exposed section is coaxially inserted into the grouting channel of the corresponding grouting steel sleeve.

[0007] a) A sunken groove is provided along the contour of the upper end of the precast concrete column; b) A lower boss is provided along the contour of the lower end of the precast concrete column. In the assembled state, the lower boss is inserted into the sunken groove, and a layered mortar-filled cavity is formed between the lower boss and the sunken groove.

[0008] The grouting steel sleeve is integrally embedded in the concrete of precast concrete column a, and the upper and lower parts of each grouting steel sleeve close to the central axis of precast concrete column a are respectively hollowed out with mortar opening a and mortar opening b.

[0009] A downwardly convex plug column is provided at the center of the lower end of the b precast concrete column, and a socket with an inner diameter larger than the outer diameter of the plug column is provided at the center of the upper end of the a precast concrete column.

[0010] An O-ring is provided on the outer ring of the lower end of the plug column; a columnar mortar pre-installation groove is provided on the lower end of the socket in coaxial communication with the axis, and the inner diameter of the columnar mortar pre-installation groove matches the outer diameter of the O-ring.

[0011] The lower part of the socket is connected to the a mortar openings of several grouting steel sleeves through several transverse a mortar channels in the a precast concrete column; the lower part of the columnar mortar pre-installed groove is connected to the b mortar openings of several grouting steel sleeves through several transverse b mortar channels in the a precast concrete column;

[0012] The root of each exposed section of b steel bar is covered with a steel plug. In the assembled state, the steel plug is inserted into the upper end of the grouting channel, and the lower end of the steel plug is just higher than each transverse a mortar channel;

[0013] When the lower end of the steel sleeve plug drops to the height of the sinking groove, the O-ring at the lower end of the column just reaches the chamfer at the lower end of the socket, thereby sealing the upper end of the mortar pre-installed groove; when the steel sleeve plug is inserted into the upper end of the grouting channel, the lower side of the column not only forms a mortar extrusion chamber, but also forms an annular mortar upwelling channel between the inner wall of the socket and the outer wall of the column. The lower part of the mortar extrusion chamber is finally connected to the annular mortar upwelling channel through the horizontal b mortar channel, the grouting channel and the horizontal a mortar channel in turn.

[0014] An assembly joint is formed between precast concrete column a and precast concrete column b.

[0015] Rheological properties selection of precast concrete mortar: slump of 50-100mm, mortar consistency value>50mm, yield stress>50Pa, plastic viscosity>50Pa·s.

[0016] When the mortar is squeezed out of the groove, the mortar is squeezed out of the groove, and ... Under the action of pressure, the mortar gradually converges from all directions to the bottom of the annular mortar upwelling channel through several enclosed transverse a mortar channels, so that the annular mortar upwelling channel can be evenly filled with viscous mortar from bottom to top. After the annular mortar upwelling channel is completely and evenly filled, the upper end of the annular mortar upwelling channel continues to upwell the mortar into the sinking trough in a ring shape; as the b precast concrete column continues to slowly descend, the lower boss is inserted into the sinking trough, and an assembly joint is formed between the a precast concrete column and the b precast concrete column; the layered mortar filling cavity formed between the lower boss and the sinking trough is completely filled with mortar, and at this time, excess mortar overflows through the assembly joint, thereby filling the assembly joint from the inside out. When the workers see mortar overflowing from the assembly joint, it means that the interior of the assembly node formed by the connection between the upper end of the a precast concrete column and the lower end of the b precast concrete column has been completely filled with viscous concrete mortar under pressure maintenance.

[0017] Beneficial effects: The present invention utilizes the gravity of the precast concrete column b during the assembly process to ensure that the grouting channel, the deflated mortar extrusion bin, the annular mortar upwelling channel and the layered mortar filling cavity are all completely filled under the pressure-maintaining state, and the assembly seam is filled from the inside out by overflowing the assembly seam, so that the connection between the upper end of the precast concrete column a and the lower end of the precast concrete column b of the present invention forms an integrated assembly node with almost no assembly traces. This assembly structure not only ensures the integrity of its structure, but also significantly improves its airtight and waterproof performance.

[0018] The mortar filled in the deflated mortar extrusion chamber at the bottom, the layered mortar filling cavity at the top, and especially the mortar upwelling channel at the middle ring wall enables the precast concrete column a and the precast concrete column b to be connected in one piece with high quality on the basis of a high bonding area.

[0019] The central annular mortar upwelling channel in this solution serves as the core path, guiding the mortar under pressure from bottom to top to evenly and fully fill the entire connection interface, ensuring an extremely high effective bonding area between precast concrete columns A and B. The mortar densely fills this three-dimensional space, leaving no dead corners, providing the two columns with excellent bonding and mechanical engagement, ultimately achieving a high-quality, highly reliable, integrated connection that far exceeds conventional assembly joints, with integrity approaching that of a cast-in-place structure. Furthermore, at the final stage of assembly, under the pressure of gravity grouting from precast concrete column B, excess mortar will actively flow outward through the assembly joint. This process cleverly fills the tiny assembly gap from the inside out. The result: a smooth, dense, and almost undetectable integrated assembly joint at the junction of the upper end of column A and the lower end of column B. This assembly structure not only ensures structural integrity but also significantly improves its airtight and waterproof properties.

[0020] At the same time, this solution does not use grouting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the precast concrete column a and the precast concrete column b in the separated state;

[0022] Figure 2 Schematic diagram of a precast concrete column and b precast concrete column from another perspective;

[0023] Figure 3 It is a cross-sectional view of the precast concrete column a and the precast concrete column b in the separated state;

[0024] Figure 4 Schematic diagram of the coordination between steel bars a and b;

[0025] Figure 5 This is a schematic diagram at the end of "Step 2";

[0026] Figure 6 This is a schematic diagram at the end of "Step 4";

[0027] Figure 7 This is a schematic diagram of the steel sleeve plug being inserted into the upper end of the grouting channel in "Step 7";

[0028] Figure 8 This is a schematic diagram of the completed assembly at the end of "Step 7";

[0029] Figure 9 This is a schematic diagram of the steel sleeve plug being disassembled. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] As attached Figures 1 to 9 An assembled concrete building node as shown Figure 1 、 2 As shown in Figure 3, it includes a precast concrete column 10 and b precast concrete column 1; the connection between the upper end of the precast concrete column 10 and the lower end of the precast concrete column 1 forms an assembly node; a plurality of a steel bars 16 extending along the length direction are implanted in the precast concrete column 10 in an enclosed shape along the circumferential contour; a plurality of b steel bars 6 extending along the length direction are implanted in the precast concrete column 1 in an enclosed shape along the circumferential contour.

[0032] like Figure 8 As shown, in the assembled state, the precast concrete column a 10 and the precast concrete column b 1 have a plurality of a steel bars 16 aligned with the plurality of b steel bars 6 one by one; the upper end of each a steel bar 16 is coaxially connected to a grouting steel sleeve 19, which is integrally embedded in the concrete of the precast concrete column a 10, and the grouting steel sleeve 19 has a grouting channel 8 open at the upper end; Figure 1 、 2 As shown in Figure 3, the lower end of each b steel bar 6 has a section exposed, and the embedded part and exposed part of the b steel bar 6 are respectively recorded as the b steel bar embedded section 6.1 and the b steel bar exposed section 6.2; in the assembled state, the b steel bar exposed section 6.2 is coaxially inserted into the grouting channel 8 in the corresponding grouting steel sleeve 19, and the gap in the grouting channel 8 is filled with concrete mortar.

[0033] like Figure 3 The upper end of the a precast concrete column 10 is provided with a sunken groove 7 along the contour, and the lower end of the b precast concrete column 1 is provided with a lower boss 3 along the contour. In the assembled state, the lower boss 3 is inserted into the sunken groove 7, and an assembly seam 24 is formed between the a precast concrete column 10 and the b precast concrete column 1, and a layered mortar filling cavity 23 is formed between the lower boss 3 and the sunken groove 7; a downwardly convex plug-in column 2 is provided in the center of the lower end of the b precast concrete column 1, and the plug-in column 2 is a columnar concrete integrated with the b precast concrete column 1, and a socket 9 with an inner diameter greater than the outer diameter of the plug-in column 2 is provided in the center of the upper end of the a precast concrete column 10; an O-ring 4 is provided on the outer ring of the lower end of the plug-in column 2; a columnar mortar pre-installed groove 11 is provided at the lower end of the socket 9 coaxially connected, and the inner diameter of the columnar mortar pre-installed groove 11 matches the outer diameter of the O-ring 4.

[0034] like Figure 4 The upper and lower parts of each grouting steel sleeve 19 close to the central axis of the precast concrete column a 10 are respectively hollowed out with a mortar port a 14 and a mortar port b 15.

[0035] like Figure 3As shown, the lower portion of the socket 9 connects to the mortar openings 14 of the grouting steel sleeves 19 through several transverse a-mortar channels 12 within the a-precast concrete column 10. The lower portion of the columnar mortar pre-installed groove 11 connects to the mortar openings 15 of the grouting steel sleeves 19 through several transverse b-mortar channels 13 within the a-precast concrete column 10. Both a-mortar channels 12 and b-mortar channels 13 are prefabricated channels, created using processes such as pre-buried pipes or direct drilling. To ensure smooth insertion, the connection between the socket 9 and the mortar pre-installed groove 11 is transitioned by a chamfer 20.

[0036] The root of each b steel bar exposed section 6.2 is equipped with a steel sleeve plug 5. The steel sleeve plug 5 is made of the same material as the b steel bar exposed section 6.2 and can be sleeved on the root of the b steel bar exposed section 6.2 by threaded sleeve or interference sleeve. The outer contour of the lower end of the steel sleeve plug 5 has a chamfered transition; the outer diameter of the steel sleeve plug 5 is consistent with the inner diameter of the grouting channel 8. In the assembled state, the steel sleeve plug 5 is inserted into the upper end of the grouting channel 8, and the lower end of the steel sleeve plug 5 is just higher than each transverse a mortar channel 12.

[0037] During the assembly and docking process, when the lower end of the steel sleeve plug 5 drops to the height of the sinking groove 7, Figure 6 As shown, the O-ring 4 at the lower end of the plug post 2 just reaches the chamfer 20 at the lower end of the socket 9, thereby sealing the upper end of the mortar pre-installed groove 11; Figure 7 As shown, when the steel sleeve plug 5 is inserted into the upper end of the grouting channel 8, not only a mortar extrusion chamber 110 is formed on the lower side of the column 2, but also an annular mortar upwelling channel 25 is formed between the inner wall of the socket 9 and the outer wall of the column 2. The lower part of the mortar extrusion chamber 110 is connected to the annular mortar upwelling channel 25 through the horizontal b mortar channel 13, the grouting channel 8 and the horizontal a mortar channel 12 in sequence.

[0038] Specific connection process and working principle:

[0039] In the working scenario, the lower end of precast concrete column a 10 has been pre-assembled and fixed on the building in the form of a pile foundation. At this time, the lower end of precast concrete column b 1 needs to be butt-jointed with the upper end of precast concrete column a 10 to form a stable assembly node. The specific gravity grouting connection process is as follows:

[0040] Precast concrete mortar rheological properties: slump of 50-100 mm according to ASTM C143 / GB / T 50080, mortar consistency >50 mm, yield stress >50 Pa, and plastic viscosity >50 Pa·s. This type of concrete mortar, due to its high viscosity, can tightly wrap the base surface, significantly improving adhesion, with a bond strength >1.5 MPa. The dense mortar structure effectively blocks moisture and air infiltration, effectively improving the waterproof seal of prefabricated building joints, thereby effectively preventing later corrosion and oxidation due to rainwater, while also enhancing freeze-thaw and carbonization resistance. The specific assembly steps are as follows:

[0041] Step 1: Pour the prepared viscous concrete mortar with predetermined rheological properties into the columnar mortar pre-loading groove 11 at the upper end of the fixed precast concrete column a 10 until the mortar liquid level in the columnar mortar pre-loading groove 11 reaches the height of the chamfer 20; because the mortar poured into the columnar mortar pre-loading groove 11 is viscous, the mortar entering the columnar mortar pre-loading groove 11 will not smoothly pass through the plurality of transverse mortar channels b 13 with an inner diameter of less than 1 cm and flow into the grouting channel 8 due to the effect of viscosity;

[0042] Step 2: Using the lifting equipment and manual guidance, align the precast concrete column b 1 vertically to the top of the precast concrete column a 10, as shown in the following figure: Figure 5 As shown;

[0043] Step 3: Using the lifting equipment and manual guidance, slowly lower the precast concrete column 1 b so that the lower end of each exposed steel bar section 6.2 b is inserted into the upper end of the grouting channel 8 in the corresponding grouting steel sleeve 19, and the column 2 is inserted downward into the socket 9;

[0044] Step 4: As the precast concrete column 1 of b continues to slowly descend, when the lower end of the steel sleeve plug 5 drops to the height of the sinking groove 7, as shown in the figure, the O-ring 4 at the lower end of the plug 2 just reaches the chamfer 20 at the lower end of the socket 9. Figure 6 shown.

[0045] Step 5: As the precast concrete column 1 continues to slowly descend, when the steel sleeve plug 5 is inserted into the upper end of the grouting channel 8, Figure 7As shown, a mortar extrusion chamber 110 is formed on the lower side of the plug 2, and an annular mortar upwelling channel 25 is formed between the inner wall of the socket 9 and the outer wall of the plug 2. At this time, as the viscous concrete mortar filled in the mortar extrusion chamber 110 is forced to pass through a plurality of transverse b mortar channels 13 to be squeezed to the bottom of each grouting channel 8 under the rigid downward squeezing of the plug 2, and gradually flows upward. Since the upper end of each grouting channel 8 has been blocked by the steel sleeve 5 at this time, the mortar squeezed into each grouting channel 8 fills each grouting channel 8 in the process of upward flow, and then gradually passes through a plurality of enclosed transverse a mortar channels 12 under the action of squeezing and converges from all directions to the bottom of the annular mortar upwelling channel 25. The viscous mortar from the bottom of the annular mortar upwelling channel 25 is gathered from all directions, so that the annular mortar upwelling channel 25 can be evenly filled with the viscous mortar from bottom to top, avoiding the problem that the viscous mortar is difficult to fill evenly due to its high viscosity. After the annular mortar upwelling channel 25 is completely and evenly filled, the upper end of the annular mortar upwelling channel 25 is annular and continues to flow the mortar into the sinking groove 7; as the b precast concrete column 1 continues to slowly descend, the lower boss 3 is inserted into the sinking groove 7, and an assembly joint 24 is formed between the a precast concrete column 10 and the b precast concrete column 1; the layered mortar filling cavity 23 formed between the lower boss 3 and the sinking groove 7 is completely filled with mortar, as shown in FIG. Figure 8 As shown, at this time, the excess mortar overflows through the assembly joint 24, thereby filling the assembly joint 24 from the inside out. When the worker sees the mortar overflowing from the assembly joint 24, it indicates that the interior of the assembly node formed by the connection between the upper end of the precast concrete column a 10 and the lower end of the precast concrete column b 1 has been completely filled with the viscous concrete mortar under the pressure-maintaining state.

[0046] The solidified mortar in the grouting channels 8 integrates the a steel bars 16 with the b steel bars 6, realizing the continuity of the steel bars of the assembled and spliced columns, making the a steel bars 16 and the b steel bars 6 firmly integrated, fundamentally ensuring the continuous force transmission of the steel bars inside the columns.

[0047] The mortar filled in the lower deflated mortar extrusion chamber 110, the upper layered mortar filling cavity 23, and especially the middle annular wall mortar upwelling channel 25 enables the precast concrete column a 10 and the precast concrete column b 1 to achieve a high-quality integrated connection on the basis of a high bonding area; the middle annular wall mortar upwelling channel 25 of this solution serves as a core path, guiding the mortar to evenly and fully fill the entire connection interface from bottom to top under pressure, ensuring that a very high effective bonding area is obtained between the precast concrete column a 10 and the precast concrete column b 1; the mortar is densely filled in this three-dimensional space without dead angles, providing the two columns with excellent bonding strength and mechanical bite force, and ultimately achieving a far higher than normal The high-quality, high-reliability integrated connection of the standard assembly node has an integrity close to that of a cast-in-place structure; the precast concrete column a 10 and the precast concrete column b 1 are almost integrated. At the same time, at the end of the assembly, under the action of the gravity grouting pressure based on the precast concrete column b 1, the excess mortar will actively overflow outward through the assembly joint; this process cleverly fills the tiny assembly gap from the inside out. As a result, at the connection between the upper end of the a column and the lower end of the b column, an integrated assembly node with a smooth appearance, a dense interior, and almost imperceptible original assembly traces is formed; this assembly structure not only ensures its structural integrity, but also significantly improves its sealing and waterproof performance.

[0048] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A prefabricated concrete building node, characterized by: It comprises a precast concrete column a (10) and a precast concrete column b (1); the connection between the upper end of the precast concrete column a (10) and the lower end of the precast concrete column b (1) forms an assembly node; A plurality of a-steel bars (16) extending in the longitudinal direction are embedded in the a precast concrete column (10) in an enclosed shape along the circumferential contour; a plurality of b-steel bars (6) extending in the longitudinal direction are embedded in the b precast concrete column (1) in an enclosed shape along the circumferential contour; the upper end of each a-steel bar (16) is integrally connected to a grouting steel sleeve (19) coaxially, and a grouting channel (8) is provided in the grouting steel sleeve (19); a section of the lower end of each b-steel bar (6) is exposed, and the embedded portion and the exposed portion of the b-steel bar (6) are respectively recorded as a b-steel embedded section (6.1) and a b-steel exposed section (6.2); In the assembled state, the exposed section (6.2) of the b steel bar is coaxially inserted into the grouting channel (8) in the corresponding grouting steel sleeve (19); The upper end of the a precast concrete column (10) is provided with a sunken groove (7) along the contour, and the lower end of the b precast concrete column (1) is provided with a lower boss (3) along the contour. In the assembled state, the lower boss (3) is inserted into the sunken groove (7), and a layered mortar filling cavity (23) is formed between the lower boss (3) and the sunken groove (7).

2. The prefabricated concrete building node according to claim 1, characterized in that: The grouting steel sleeve (19) is integrally embedded in the concrete of the a precast concrete column (10), and the upper and lower parts of each grouting steel sleeve (19) close to the central axis of the a precast concrete column (10) are respectively hollowed out with a mortar opening a (14) and a mortar opening b (15).

3. The prefabricated concrete building node according to claim 2, characterized in that: A downwardly convex insertion column (2) is provided at the center of the lower end of the b precast concrete column (1), and a socket (9) having an inner diameter greater than the outer diameter of the insertion column (2) is provided at the center of the upper end of the a precast concrete column (10).

4. The prefabricated concrete building node according to claim 3, characterized in that: The outer ring of the lower end of the plug column (2) is provided with an O-type sealing ring (4); the lower end of the socket (9) is coaxially connected and provided with a columnar mortar pre-installed groove (11), and the inner diameter of the columnar mortar pre-installed groove (11) matches the outer diameter of the O-type sealing ring (4).

5. The prefabricated concrete building node according to claim 4, characterized in that: The lower portion of the socket (9) is connected to the a mortar openings (14) of the plurality of grouting steel sleeves (19) through a plurality of transverse a mortar channels (12) in the a precast concrete column (10); the lower portion of the columnar mortar pre-installed groove (11) is connected to the b mortar openings (15) of the plurality of grouting steel sleeves (19) through a plurality of transverse b mortar channels (13) in the plurality of a precast concrete columns (10); The root of each exposed section (6.2) of the b steel bar is sheathed with a steel plug (5). In the assembled state, the steel plug (5) is inserted into the upper end of the grouting channel (8), and the lower end of the steel plug (5) is just higher than each transverse a mortar channel (12); When the lower end of the steel sleeve plug (5) descends to the height of the sinking groove (7), the O-ring (4) at the lower end of the plug post (2) just reaches the chamfer (20) at the lower end of the socket (9), thereby sealing the upper end of the mortar pre-installed groove (11); when the steel sleeve plug (5) is inserted into the upper end of the grouting channel (8), the lower side of the plug post (2) not only forms a mortar extrusion chamber (110), but also forms an annular mortar upwelling channel (25) between the inner wall of the socket (9) and the outer wall of the plug post (2), and the lower part of the mortar extrusion chamber (110) is finally connected to the annular mortar upwelling channel (25) through the transverse b mortar channel (13), the grouting channel (8) and the transverse a mortar channel (12) in sequence.

6. The prefabricated concrete building node according to claim 5, characterized in that: An assembly seam (24) is formed between the precast concrete column a (10) and the precast concrete column b (1).

7. The prefabricated concrete building node according to claim 6, characterized in that: Rheological properties selection of precast concrete mortar: slump of 50-100mm, mortar consistency value>50mm, yield stress>50Pa, plastic viscosity>50Pa·s.

8. The gravity grouting process for prefabricated concrete building nodes according to claim 8, characterized in that: Pour the viscous concrete mortar into the columnar mortar pre-installed groove (11) of the precast concrete column a (10) in advance; control the lower end of each exposed section (6.2) of the b steel bar of the precast concrete column b (1) to gradually insert downward into the grouting channel (8) in the corresponding grouting steel sleeve (19); and insert the column (2) downward into the socket (9); When the lower end of the steel sleeve plug (5) descends to the height of the sinking trough (7), the O-ring (4) at the lower end of the plug post (2) just reaches the chamfer (20) at the lower end of the socket (9); when the steel sleeve plug (5) is inserted into the upper end of the grouting channel (8), a mortar extrusion chamber (110) is formed on the lower side of the plug post (2), and an annular mortar upwelling channel (25) is formed between the inner wall of the socket (9) and the outer wall of the plug post (2). At this time, as the viscous concrete mortar filled in the mortar extrusion chamber (110) is forced to pass through the plurality of transverse b mortar channels (13) and squeezed into each grouting channel (8) under the rigid downward extrusion of the plug post (2), The mortar flows to the bottom of the annular mortar upwelling channel (25) and gradually flows upward. Since the upper ends of the grouting channels (8) have been blocked by the steel sleeve plugs (5), the mortar squeezed into the grouting channels (8) is filled in the process of flowing upward. Then, under the action of squeezing, the mortar gradually passes through a plurality of enclosed transverse a mortar channels (12) and converges from all directions to the bottom of the annular mortar upwelling channel (25), so that the annular mortar upwelling channel (25) can be evenly filled with viscous mortar from bottom to top. After the annular mortar upwelling channel (25) is completely and evenly filled, the upper end of the annular mortar upwelling channel (25) forms a ring and continues to upwell the mortar into the sinking trough (7); As the b precast concrete column (1) continues to slowly descend, when the lower boss (3) is inserted into the sinking groove (7), and an assembly joint (24) is formed between the a precast concrete column (10) and the b precast concrete column (1); the layered mortar filling cavity (23) formed between the lower boss (3) and the sinking groove (7) is completely filled with mortar, and at this time, excess mortar overflows through the assembly joint (24), thereby filling the assembly joint (24) from the inside out. When the worker sees the mortar overflowing from the assembly joint (24), it means that the interior of the assembly node formed at the connection between the upper end of the a precast concrete column (10) and the lower end of the b precast concrete column (1) has been completely filled with viscous concrete mortar under pressure.

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