Longitudinal multi-width prefabricated underground diaphragm wall and grouting assembly process thereof

Abstract

The invention discloses a longitudinal multi-width prefabricated underground diaphragm wall and a grouting assembly process thereof. The longitudinal multi-width prefabricated underground diaphragm wall at least comprises an upper-width prefabricated wall, a middle-width prefabricated wall and a lower-width prefabricated wall. A plurality of structural columns extending downwards are pre-buried in the upper prefabricated wall, a plurality of longitudinal through structural sleeves are pre-buried in the middle prefabricated wall, and a plurality of structural columns extending upwards are pre-buried in the lower prefabricated wall; in the splicing state, the structure columns, extending downwards, in the upper prefabricated wall are downwards inserted into the structure sleeves of the middle prefabricated wall. The structural columns extending upwards in the lower prefabricated wall are upwards inserted into the structural sleeves of the middle prefabricated wall; and in the splicing process of the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall, gaps between the structural sleeves and the structural columns are gradually filled with concrete grout from bottom to top.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of longitudinal multi-span continuous wall. BACKGROUND

[0002] The prefabricated underground continuous wall is a high-efficiency underground structure form, and its popularization and application are often restricted by objective conditions.

[0003] On the one hand, due to the strict road height, width and weight restrictions on the transportation of large prefabricated components, and the limited space at the construction site, it is difficult to meet the huge radius of rotation required for hoisting large components, and these factors together limit the length of single-span prefabricated underground continuous walls. In current industry practice, it is usually controlled within 12-16 meters.

[0004] However, the excavation depth of modern deep foundation pit engineering is increasing, and the vertical insertion depth, i.e. the soil depth, of single or double-span prefabricated walls often cannot meet the overall stability and bearing capacity requirements required by the design; therefore, in engineering practice, three or more prefabricated wall segments are connected and stacked vertically to achieve the total depth of the wall required by the design; if the vertical connection method of three wall segments is used, the structure at the connection between the upper and lower adjacent two or three wall segments needs to ensure its integrity, so grouting connection technology is required. Due to the large total height of the three wall segments in the longitudinal direction, it is difficult to build a pressurized pipeline grouting device under such conditions, and the on-site pipeline pressurized grouting device is not only complicated in construction process, but also difficult to build and implement. SUMMARY

[0005] The present application provides a longitudinal multi-span prefabricated underground continuous wall and its grouting assembly process, which eliminates the need for a pressurized pipeline grouting device after assembly and splicing.

[0006] Technical solution: To achieve the above-mentioned purpose, a longitudinal multi-span prefabricated underground continuous wall according to the present application comprises at least an upper prefabricated wall, a middle prefabricated wall and a lower prefabricated wall in the longitudinal direction; the upper prefabricated wall is pre-buried with a plurality of downward extending structural columns, the middle prefabricated wall is pre-buried with a plurality of longitudinal through structural sleeves, and the lower prefabricated wall is pre-buried with a plurality of upward extending structural columns.

[0007] In the spliced state, the downward extending structural columns in the upper prefabricated wall are inserted into the structural sleeves of the middle prefabricated wall, and the upward extending structural columns in the lower prefabricated wall are inserted into the structural sleeves of the middle prefabricated wall; the concrete slurry is gradually filled into the gap between the structural sleeves and the structural columns from bottom to top during the splicing process of the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall.

[0008] Further, the structural columns in the upper prefabricated wall include a left upper structural column, a central upper structural column, and a right upper structural column; the structural sleeves in the middle prefabricated wall include a left structural sleeve, a central structural sleeve, and a right structural sleeve; the structural columns in the lower prefabricated wall include a left lower structural column and a right lower structural column.

[0009] In the spliced state, the lower ends of the left upper structural column, the central upper structural column, and the right upper structural column are respectively inserted into the upper ends of the left structural sleeve, the central structural sleeve, and the right structural sleeve; the upper ends of the left lower structural column and the right lower structural column are respectively inserted into the lower ends of the left structural sleeve and the right structural sleeve.

[0010] Further, the upper end of the lower prefabricated wall is provided with a first splicing groove, and the upper end of the middle prefabricated wall is provided with a second splicing groove.

[0011] The lower end of the middle prefabricated wall is provided with a first plug-in boss compatible with the inner contour of the first splicing groove, and the lower end of the upper prefabricated wall is provided with a second plug-in boss compatible with the inner contour of the second splicing groove.

[0012] Further, in the completely spliced state of the first splicing groove and the first plug-in boss, a first horizontal filling bin is formed between the first splicing groove and the first plug-in boss; in the completely spliced state of the second splicing groove and the second plug-in boss, a second horizontal filling bin is formed between the second splicing groove and the second plug-in boss.

[0013] Further, the upper end of the lower prefabricated wall is provided with a sunken groove, and the inner wall of the sunken groove is pre-fitted with a lower structural sleeve with an inner diameter coaxial with the inner diameter of the central structural sleeve.

[0014] The central structural sleeve of the middle prefabricated wall is coaxially provided with a transmission column, and an annular mortar filling cavity is formed between the transmission column and the inner wall of the central structural sleeve; a friction ring is fixedly arranged at the lower end of the central structural sleeve, the lower end of the transmission column is sleeved in the inner circle of the friction ring, the inner circle of the friction ring tightly holds the lower end of the transmission column, and the maximum static friction between the friction ring and the transmission column is Fmax; the gravity of the upper prefabricated wall is G1, the gravity of the transmission column is G2; G1+G2 Fmax>G2, so that the prefabricated structure of the middle prefabricated wall is synchronized with the middle prefabricated wall under the action of static friction.

[0015] Further, the upper end surface of the first splicing groove and the second splicing groove is provided with a circle of rubber sealing pads along the contour.

[0016] Further, the upper prefabricated wall, the middle prefabricated wall, and the lower prefabricated wall are respectively provided with longitudinally extending guide clamping grooves and longitudinally extending guide convex strips on both sides; the guide clamping grooves and the guide convex strips are matched with each other, thereby realizing the splicing of the adjacent two prefabricated continuous walls in the horizontal direction.

[0017] A grouting assembly process between an upper prefabricated wall, a middle prefabricated wall and a lower prefabricated wall of longitudinal multi-section prefabricated underground continuous walls.

[0018] Step one, insert the lower prefabricated wall into a deep foundation pit, and fill the concrete slurry into the sinking groove.

[0019] Step two, hoist the middle prefabricated wall above the lower prefabricated wall and align it, then slowly lower the middle prefabricated wall, so that the upper ends of the left and right lower structural columns are respectively inserted into the lower ends of the left and right structural sleeves, and finally the first insertion boss is aligned and inserted into the first splicing groove to realize splicing.

[0020] Step three, hoist the upper prefabricated wall above the middle prefabricated wall and align it, then slowly lower the upper prefabricated wall, so that the central upper structural column is coaxially contacted and the upper end of the transmission column is pushed down, because G+G Fmax, the transmission column slowly descends synchronously with the central upper structural column by overcoming Fmax, the middle prefabricated wall still stays in place, and the left and right upper structural columns are gradually inserted into the left and right structural sleeves; in the process of downward displacement of the transmission column by overcoming Fmax, the transmission column is gradually inserted into the sinking groove until the second insertion boss is completely inserted into the second splicing groove, and the second horizontal filling bin between the second splicing groove and the second insertion boss is completely filled with mortar.

[0021] Beneficial effects: The process of using pressurized pipeline grouting equipment after assembly and splicing is omitted, the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall realize the finishing stage of mutual splicing, the second horizontal filling bin, the left and right structural sleeves and the annular mortar filling cavity are completely filled with concrete mortar, and just enter the completely sealed state, thereby effectively ensuring the integrity of the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall after solidification, and effectively saving the construction time; such assembly structure not only ensures the integrity of the structure, but also significantly improves the airtight and waterproof performance.

[0022] In the assembly process, the transmission column structure plays a key role, the mortar is uniformly and fully filled in the entire connection interface from bottom to top under the driving of the transmission column, ensuring that the connection between the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall and the internal joint gap have a very high effective bonding area, and the mortar is dense and full, with no dead angle filling, and the integrity approaches to an integral cast-in-place structure, and after the assembly is completed, the transmission column serves as part of the steel structure and plays a core structural role. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the upper prefabricated wall, the middle prefabricated wall and the lower prefabricated wall;

[0024] Figure 2 is a sectional view of the wall structure; Figure 1

[0025] Figure 3 is a schematic view of a middle section of the prefabricated wall structure;

[0026] Figure 4 is a schematic view of the splicing between any two prefabricated continuous walls that are horizontally adjacent;

[0027] Figure 5 is a front view of the wall structure; Figure 2

[0028] Figure 6 is a schematic view of the lifting device of "step three" lifting the upper section of the prefabricated wall directly above the middle section of the prefabricated wall;

[0029] Figure 7 is a sectional view of the prefabricated wall structure after the upper section, the middle section and the lower section of the prefabricated wall are completely spliced. DETAILED DESCRIPTION

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

[0031] As shown in the accompanying drawings, a longitudinal multi-section prefabricated underground continuous wall includes at least an upper section of the prefabricated wall 1, a middle section of the prefabricated wall 2 and a lower section of the prefabricated wall 3. Figures 1 to 7 The upper section of the prefabricated wall 1 is embedded with a plurality of downward extending structural columns, the middle section of the prefabricated wall 2 is embedded with a plurality of longitudinally extending structural sleeves, and the lower section of the prefabricated wall 3 is embedded with a plurality of upward extending structural columns.The main body of the upper section of the prefabricated wall 1, the middle section of the prefabricated wall 2 and the lower section of the prefabricated wall 3 is made of concrete structure, and the structural columns and the structural sleeves are made of HRB400 or HRB500 steel.

[0032] In the splicing state, the downward extending structural columns of the upper section of the prefabricated wall 1 are inserted into the structural sleeves of the middle section of the prefabricated wall 2, and the upward extending structural columns of the lower section of the prefabricated wall 3 are inserted into the structural sleeves of the middle section of the prefabricated wall 2.

[0033] As shown in the accompanying drawings, the structural columns of the upper section of the prefabricated wall 1 include a left upper structural column 7a, a central upper structural column 6 and a right upper structural column 7b. Figure 3 The lower end of the central upper structural column 6 is lower than the lower ends of the left upper structural column 7a and the right upper structural column 7b. 5

[0034] ​​The structure sleeve in the middle width prefabricated wall 2 includes a left structure sleeve 13a, a central structure sleeve 16 and a right structure sleeve 13b; the structure column in the lower width prefabricated wall 3 includes a left lower structure column 9a and a right lower structure column 9b.

[0035] As Figure 7 In the splicing state, the lower ends of the left upper structure column 7a, the central upper structure column 6 and the right upper structure column 7b are respectively inserted into the upper ends of the left structure sleeve 13a, the central structure sleeve 16 and the right structure sleeve 13b; the upper ends of the left lower structure column 9a and the right lower structure column 9b are respectively inserted into the lower ends of the left structure sleeve 13a and the right structure sleeve 13b.

[0036] The upper end of the lower width prefabricated wall 3 is provided with a first splicing groove 12, and the upper end of the middle width prefabricated wall 2 is provided with a second splicing groove 8; the lower end of the middle width prefabricated wall 2 is provided with a first plug-in boss 41 which is adapted to the inner contour of the first splicing groove 12, and the lower end of the upper width prefabricated wall 1 is provided with a second plug-in boss 45 which is adapted to the inner contour of the second splicing groove 8; the upper end faces of the first splicing groove 12 and the second splicing groove 8 are both provided with a ring of rubber sealing pads along the contour.

[0037] In the completely splicing state of the first splicing groove 12 and the first plug-in boss 41, a first horizontal filling bin 12a is formed between the first splicing groove 12 and the first plug-in boss 41; in the completely splicing state of the second splicing groove 8 and the second plug-in boss 45, a second horizontal filling bin 8a is formed between the second splicing groove 8 and the second plug-in boss 41.

[0038] The upper end of the lower width prefabricated wall 3 is provided with a columnar sunken groove 10, and the inner wall of the sunken groove 10 is pre-fitted with a lower structure sleeve 11 which has the same coaxial center as the inner diameter of the central structure sleeve 16; the central structure sleeve 16 is coaxially provided with a transmission column 15, and an annular mortar filling cavity 14 is formed between the transmission column 15 and the inner wall of the central structure sleeve 16, the thickness of the annular mortar filling cavity 14 in the radial direction is more than 3 cm, and the mortar can flow smoothly; the lower end of the central structure sleeve 16 is fixedly provided with a friction ring 17, the lower end of the transmission column 15 is fitted into the inner ring of the friction ring 17, and the inner wall of the friction ring 17 can be made of compressed rubber material, the inner ring of the friction ring 17 forms a holding force on the lower end of the transmission column 15, and the maximum static friction between the friction ring 17 and the transmission column 15 is Fmax; the gravity of the upper width prefabricated wall 1 is G1, and the gravity of the transmission column 15 is G2; Fmax>G2. The meaning of “” is much larger, and the numerical value is at least ten times different, so that the transmission column 15 is synchronized with the middle width prefabricated wall 2 under the action of the static friction on the prefabricated structure of the middle width prefabricated wall 2.

[0039] As Figure 4 ​As shown, longitudinally extending guide slots 4 and longitudinally extending guide convex strips 5 are respectively provided on both sides of the upper prefabricated wall 1, the middle prefabricated wall 2 and the lower prefabricated wall 3; the guide slots 4 and the guide convex strips 5 cooperate with each other to achieve seamless splicing between any two laterally adjacent prefabricated continuous walls.

[0040] Grouting assembly process between the upper prefabricated wall 1, the middle prefabricated wall 2 and the lower prefabricated wall 3 of a longitudinal multi-span prefabricated underground continuous wall:

[0041] Step 1: insert the lower prefabricated wall 3 into the deep foundation pit according to the conventional construction process of prefabricated underground continuous wall, and then pre-fill the sinking trough 10 of the completed lower prefabricated wall 3 with concrete slurry.

[0042] Step 2: Use a lifting device to lift the middle prefabricated wall 2 just above the lower prefabricated wall 3, and by fine-tuning the horizontal position and posture of the lifted middle prefabricated wall 2, the left structural sleeve 13a and the right structural sleeve 13b of the middle prefabricated wall 2 are aligned with the lower left structural column 9a and the lower right structural column 9b respectively; then, under the action of the lifting device, the middle prefabricated wall 2 slowly descends, so that the upper ends of the lower left structural column 9a and the lower right structural column 9b are inserted into the lower ends of the left structural sleeve 13a and the right structural sleeve 13b respectively, and finally the first plug-in boss 41 is aligned and inserted into the first splicing groove 12 to realize splicing. Under the action of the gravity of the middle prefabricated wall 2, a circle of rubber sealing gasket along the contour of the upper end of the first splicing groove 12 is sealed with the contour of the lower end of the middle prefabricated wall 2, and a first horizontal filling bin 12a is formed between the first splicing groove 12 and the first plug-in boss 41; at this time, the splicing process of the middle prefabricated wall 2 is completed.

[0043] Step 3: The hoisting device lifts the upper prefabricated wall 1 to the top of the middle prefabricated wall 2. Figure 6 As shown, by fine-tuning the horizontal position and posture of the hoisted upper prefabricated wall 1, the central upper structural column 6 of the upper prefabricated wall 1 is aligned with the transfer column 15 in the lower middle prefabricated wall 2; then, under the action of the hoisting device, the upper prefabricated wall (1) slowly descends, so that the central upper structural column 6 contacts the axis and pushes down the upper end of the transfer column 15. Due to G1+G2 Fmax, the transfer column 15 overcomes Fmax and slowly descends synchronously with the central upper structural column 6 under the push of the central upper structural column 6, the middle prefabricated wall 2 remains in place, and the upper left structural column 7a and the upper right structural column 7b are gradually inserted downward into the left structural sleeve 13a and the right structural sleeve 13b.

[0044] The transmission column 15 gradually inserts into the sinking groove 10 in the process of being displaced downward to overcome Fmax, and the mortar slurry originally filled in the sinking groove 10 gradually overflows upward into the first horizontal filling bin 12a due to the gradual insertion of the transmission column 15. As the transmission column 15 continues to descend, the first horizontal filling bin 12a is completely filled with the mortar, and then the mortar at the top of the first horizontal filling bin 12a continues to be pressed upward into the gap in the left structural sleeve 13a and the right structural sleeve 13b under the drive of the pressure. As the transmission column 15 continues to descend, the gap in the left structural sleeve 13a and the right structural sleeve 13b is completely filled with the mortar, and then the mortar overflows upward from the upper end of the gap in the left structural sleeve 13a and the right structural sleeve 13b into the second splicing groove 8, so that the liquid level in the second splicing groove 8 gradually rises. The mortar entering the second splicing groove 8 gradually leaks downward into the annular mortar filling cavity 14 under the action of gravity, and the liquid level in the second splicing groove 8 continues to rise until the liquid level in the second splicing groove 8 rises to be about to be flush with the upper end of the middle-span prefabricated wall 2.

[0045] As the upper-span prefabricated wall 1 continues to descend, the second insertion boss 45 gradually inserts downward into the second splicing groove 8, and the excess mortar in the upper part of the second splicing groove 8 gradually overflows outward. When the second insertion boss 45 is completely inserted into the second splicing groove 8, the second horizontal filling bin 8a formed between the second splicing groove 8 and the second insertion boss 41 is completely filled with the mortar. At the same time, under the action of the gravity of the upper-span prefabricated wall 1, the upper end of the second splicing groove 8 is in sealing cooperation with the lower end contour of the upper-span prefabricated wall 1 along a circle of rubber sealing pads, so that the upper-span prefabricated wall 1, the middle-span prefabricated wall 2 and the lower-span prefabricated wall 3 achieve the final stage of mutual splicing. The second horizontal filling bin 8a, the left structural sleeve 13a, the right structural sleeve 13b and the annular mortar filling cavity 14 are all completely filled with the concrete mortar, and are just in the completely sealed state, as shown in FIG. 8, so as to effectively ensure the integrity of the upper-span prefabricated wall 1, the middle-span prefabricated wall 2 and the lower-span prefabricated wall 3 after solidification, and the process of separate grouting is saved, thereby effectively saving the construction time. Figure 7

[0046] The transmission column 15 of the scheme plays a dynamic transmission role in the assembly process, and after the assembly is completed, the transmission column 15 serves as part of the steel structure and plays a core structural role.

[0047] The above only describes the preferred embodiments of the present application, and it should be noted that those of ordinary skill in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the protection scope of the present application.​

Claims

1. A longitudinal multi-span prefabricated underground continuous wall, characterized by: The longitudinal prefabricated continuous wall comprises at least an upper prefabricated wall (1), a middle prefabricated wall (2) and a lower prefabricated wall (3); The upper prefabricated wall (1) is pre-embedded with a plurality of structural columns extending downward, the middle prefabricated wall (2) is pre-embedded with a plurality of longitudinally penetrating structural sleeves, and the lower prefabricated wall (3) is pre-embedded with a plurality of structural columns extending upward; In the spliced ​​state, the downwardly extending structural column in the upper prefabricated wall (1) is inserted downwardly into the structural sleeve of the middle prefabricated wall (2); The structural columns extending upward in the lower prefabricated wall (3) are inserted upward into the structural sleeves of the middle prefabricated wall (2); and the concrete slurry is gradually filled into the gaps between the structural sleeves and the structural columns from bottom to top during the splicing process of the upper prefabricated wall (1), the middle prefabricated wall (2) and the lower prefabricated wall (3).

2. The longitudinal multi-span prefabricated underground continuous wall according to claim 1, characterized in that: The structural columns of the upper prefabricated wall (1) include an upper left structural column (7a), an upper central structural column (6), and an upper right structural column (7b); The structural sleeve in the middle prefabricated wall (2) comprises a left structural sleeve (13a), a central structural sleeve (16) and a right structural sleeve (13b); The structural columns in the lower prefabricated wall (3) include a lower left structural column (9a) and a lower right structural column (9b); In the spliced ​​state, the lower ends of the left upper structural column (7a), the central upper structural column (6) and the right upper structural column (7b) are respectively inserted into the upper ends of the left structural sleeve (13a), the central structural sleeve (16) and the right structural sleeve (13b); and the upper ends of the left lower structural column (9a) and the right lower structural column (9b) are respectively inserted into the lower ends of the left structural sleeve (13a) and the right structural sleeve (13b).

3. The longitudinal multi-span prefabricated underground continuous wall according to claim 2, characterized in that: The upper end of the lower prefabricated wall (3) is provided with a first splicing groove (12), and the upper end of the middle prefabricated wall (2) is provided with a second splicing groove (8); The lower end of the middle prefabricated wall (2) is provided with a first plug-in boss (41) adapted to the inner contour of the first splicing groove (12), and the lower end of the upper prefabricated wall (1) is provided with a second plug-in boss (45) adapted to the inner contour of the second splicing groove (8).

4. The longitudinal multi-span prefabricated underground continuous wall according to claim 3, characterized in that: When the first splicing groove (12) and the first plug-in boss (41) are in a fully spliced ​​state, a first horizontal filling bin (12a) is formed between the first splicing groove (12) and the first plug-in boss (41); when the second splicing groove (8) and the second plug-in boss (45) are in a fully spliced ​​state, a second horizontal filling bin (8a) is formed between the second splicing groove (8) and the second plug-in boss (41).

5. The longitudinal multi-span prefabricated underground continuous wall according to claim 4, characterized in that: A sinking groove (10) is provided at the center of the upper end of the lower prefabricated wall (3), and the inner wall of the sinking groove (10) is pre-sheathed with a lower structural sleeve (11) whose inner diameter is coaxial with the inner diameter of the central structural sleeve (16); A transfer column (15) is coaxially arranged in the central structural sleeve (16) of the middle prefabricated wall (2), and an annular mortar filling cavity (14) is formed between the transfer column (15) and the inner wall of the central structural sleeve (16); a friction ring (17) is fixedly arranged on the inner ring of the lower end of the central structural sleeve (16), and the lower end of the transfer column (15) is sleeved on the inner ring of the friction ring (17), and the inner ring of the friction ring (17) forms a clamping force on the lower end of the transfer column (15). The maximum static friction force between the friction ring (17) and the transfer column (15) is assumed to be Fmax; the gravity of the upper prefabricated wall (1) is G1, and the gravity of the transfer column (15) is G2; G1+G2 is satisfied. Fmax>G2, so that the transfer column (15) on the prefabricated structure of the middle-width prefabricated wall (2) is synchronized with the middle-width prefabricated wall (2) under the action of static friction.

6. The longitudinal multi-span prefabricated underground continuous wall according to claim 5, characterized in that: The upper end surfaces of the first splicing groove (12) and the second splicing groove (8) are both provided with a circle of rubber sealing gasket along the contour.

7. The longitudinal multi-span prefabricated underground continuous wall according to claim 1, characterized in that: Both sides of the upper prefabricated wall (1), the middle prefabricated wall (2) and the lower prefabricated wall (3) are respectively provided with longitudinally extending guide slots (4) and longitudinally extending guide convex strips (5); the guide slots (4) and the guide convex strips (5) cooperate with each other, thereby achieving seamless splicing between any two laterally adjacent prefabricated continuous walls.

8. The grouting assembly process between the upper prefabricated wall (1), the middle prefabricated wall (2) and the lower prefabricated wall (3) of a longitudinal multi-span prefabricated underground continuous wall according to claim 5, characterized in that: Step 1: insert the lower prefabricated wall (3) into the deep foundation pit and fill the sinking trough (10) with concrete slurry; Step 2: The middle prefabricated wall (2) is hung above the lower prefabricated wall (3) and aligned; then the middle prefabricated wall (2) is slowly lowered so that the upper ends of the left lower structural column (9a) and the right lower structural column (9b) are respectively inserted into the lower ends of the left structural sleeve (13a) and the right structural sleeve (13b), and finally the first plug-in boss (41) is aligned and inserted into the first splicing groove (12) to achieve splicing: Step 3: Hang the upper prefabricated wall (1) above the middle prefabricated wall (2) and align them. Then, slowly lower the upper prefabricated wall (1) so that the central upper structural column (6) contacts the axis and pushes down the upper end of the transfer column (15). Fmax, the transfer column (15) overcomes Fmax under the push of the central upper structural column (6) and slowly descends synchronously with the central upper structural column (6), the middle prefabricated wall (2) remains in place, and the left upper structural column (7a) and the right upper structural column (7b) gradually insert downward into the left structural sleeve (13a) and the right structural sleeve (13b); in the process of overcoming Fmax and moving downward, the transfer column (15) gradually inserts downward into the sinking groove (10) until the second plug-in boss (45) is completely inserted into the second splicing groove (8), and a second horizontal filling bin (8a) completely filled with mortar is formed between the second splicing groove (8) and the second plug-in boss (41).

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