A self-locking column type joint and prefabricated assembled diaphragm wall

Abstract

The present invention relates to the technical field of building structures, and discloses a self-locking column type joint prefabricated diaphragm wall that can be assembled, including a precast wall body, a steel bar extension unit, and a pouring and locking unit. A plurality of pairs of insertion covers for assembly in the present invention are not on the same straight line, and the plurality of pairs of insertion covers can form a triangle, and the structural strength of the equipment connection part can be improved through the triangle. When the structure is subjected to external forces, such as wind force and seismic force, the triangular shape can effectively resist deformation. Compared with the structure with connection points on the same straight line, this non-linearly distributed connection point can make the structure more stable and not easily twist or collapse. And after the insertion covers and the insertion holes are assembled, at this time, the extended steel bars can complete the rotation operation, so that the extended steel bars located on the side of the insertion covers move to the processing station. Therefore, there are extended steel bars and longitudinal steel bars in the pouring chamber at this time, and thus this position becomes more secure after pouring.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structures, and specifically relates to a self-locking column type joint prefabricated diaphragm wall that can be assembled. Background Art

[0002] In building construction, the diaphragm wall is a commonly used form of foundation retaining structure. After the current wall assembly method is completed, it is necessary to pour at the assembly position to achieve stable connection.

[0003] However, there are many problems in the existing connection positions. On the one hand, there is no reinforcement, which greatly affects the structural stability. When the diaphragm wall bears large pressure, tension or lateral force, it is easy to deform or even break, reducing the safety and reliability of the building. On the other hand, during the pouring and setting process, it is necessary to support the two walls all the time to prevent the walls from moving. This not only consumes a large amount of manpower and material resources, increasing the construction cost, but also once the walls move, it will seriously affect the pouring effect, resulting in problems such as loose connection and gaps between the walls, and then affecting the waterproofness and integrity of the entire diaphragm wall.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A self-locking column type joint prefabricated diaphragm wall that can be assembled, including a precast wall body, and a steel bar expansion unit and a pouring locking unit installed on both sides of the precast wall body.

[0007] The steel bar expansion unit includes three pairs of insertion covers. The three pairs of insertion covers are installed on the side wall of the precast wall body, and the three pairs of insertion covers are not in the same vertical plane. A number of pairs of longitudinal steel bars are installed on the end faces of the three pairs of insertion covers. One end of each longitudinal steel bar is placed in the inner cavity of the insertion cover. A push rod is movably installed on each pair of insertion covers. One end of the push rod is movably inserted into a positioning sleeve installed inside the insertion cover. A stop block is slidably arranged inside the positioning sleeve, and one end of the stop block is connected to the push rod. The other end of the stop block is rotatably installed with a push rod, and a synchronous support is installed on the push rod, and a synchronous plate is installed on the synchronous support. Four pairs of turning plates are rotatably installed around each pair of insertion covers. A number of pairs of expansion steel bars are installed on each pair of turning plates. A rocker arm is installed at the rotation center of the turning plate, and the rocker arm is slidably connected to the synchronous plate. The synchronous plate horizontally slides to drive the rocker arm and the expansion steel bars to rotate 90 degrees, and one end of the expansion steel bars rotated 90 degrees is placed in the inner cavity of the insertion cover;

[0008] The pouring and locking unit includes a positioning plate which is oval-shaped and is adapted to a locking groove formed on the side wall at the other end of the precast wall. A shielding plate is connected to the locking groove. An oval through-hole is installed on the shielding plate and is adapted to the positioning plate. The inserting cover is adapted to a pouring chamber formed on the side wall of the precast wall. A communicating pipe is installed on the positioning sleeve. The central axis of the communicating pipe and that of the stopper are not on the same straight line. The communicating pipe communicates with a locking cavity formed on the inner side wall of the stopper. A number of pairs of baffle plates are installed around the inner part of the locking cavity.

[0009] As a preferred embodiment of the present invention, an installation plate is welded on the side wall of the inserting cover and is integrally cast with the precast wall. A through-hole is formed on the inserting cover and communicates with the inner chamber of the inserting cover.

[0010] As a preferred embodiment of the present invention, a first connecting sleeve is installed through the end face of the inserting cover. A corresponding longitudinal steel bar is movably inserted into the first connecting sleeve. A first locking bolt is rotatably installed on the first connecting sleeve, and the end of the first locking bolt is in close contact with the longitudinal steel bar. The length of the longitudinal steel bar outside the inserting cover is less than that of the ejector rod outside the inserting cover.

[0011] As a preferred embodiment of the present invention, the stopper is in close contact with the inner wall of the positioning sleeve. A return spring is sleeved on the side wall of the push rod located in the inner cavity of the positioning sleeve. One end of the return spring is clamped on the inner wall of the positioning sleeve, and the other end of the return spring is clamped on the side wall of the stopper.

[0012] As a preferred embodiment of the present invention, a second connecting sleeve is welded on each pair of the turning plates. An extended steel bar is movably inserted through the second connecting sleeve. A second locking bolt is screwed and installed on the surface of the second connecting sleeve, and the bottom of the second locking bolt is in close contact with the extended steel bar.

[0013] As a preferred embodiment of the present invention, a pair of fixing rods are installed on the surface of each pair of the turning plates. A fixing seat is rotatably installed at the ends of the pair of fixing rods, and the fixing seat is welded on the surface of the inserting cover. A torsion spring is installed at the rotation center of the fixing rod. One end of the torsion spring is clamped on the fixing seat, and the other end of the torsion spring is clamped on the fixing rod.

[0014] As a preferred embodiment of the present invention, a rocker arm is installed on the rotation axis of the pair of fixing rods. The rocker arm movably penetrates through a notch formed on the surface of the inserting cover. The pair of rocker arms are in an inclined state, and a strip-shaped groove is formed on the surface of the pair of rocker arms. A sliding rod is slidably arranged on the strip-shaped groove, and the sliding rod is connected with a synchronous plate. The synchronous plate is placed in the gap between the pair of rocker arms.

[0015] As a preferred embodiment of the present invention, three pairs of jacks are provided on the side wall of the precast wall body. Each pair of jacks communicates with the corresponding pouring chamber, and the diameter of the jacks is smaller than the diameter of the socket. Pouring passages are connected between several pairs of pouring chambers. A pouring port is provided at the top of the precast wall body, and the pouring port communicates with the pouring chamber at the top.

[0016] As a preferred embodiment of the present invention, a blocking block is installed inside the locking groove, and the blocking block is used to limit the rotation angle of the positioning plate.

[0017] As a preferred embodiment of the present invention, the connecting pipe movably penetrates through the socket. A receiving hopper is installed at the top of the connecting pipe. A positioning rod is installed on the outer shell of the receiving hopper, and the positioning rod communicates with the side wall of the socket. The width of the connecting pipe is greater than the length of the locking cavity.

[0018] The present invention has the following beneficial effects compared with the prior art:

[0019] For the present invention, several pairs of sockets used for assembly are not on the same straight line. Several pairs of sockets can form a triangle. The structural strength of the equipment connection can be improved through the triangle. When the structure is subjected to external forces such as wind force and seismic force, the triangular shape can effectively resist deformation. Compared with the structure with connection points on the same straight line, this non-linearly distributed connection point can make the structure more stable and not easily twist or collapse. And when the connection points are not on the same straight line, the natural vibration frequency and vibration mode of the building structure become more complex. Different connection point distributions will result in different stiffness distributions of the structure, making it difficult for the structure to completely match the frequency of seismic waves under the action of seismic waves, thereby reducing the possibility of resonance, being safer to use. And after the sockets and jacks are assembled, at this time, the extended steel bars can complete the rotation operation, so that the extended steel bars located on the side of the socket move to the pouring station. Therefore, there are extended steel bars and longitudinal steel bars in the pouring chamber at this time, and then this position becomes more reliable after pouring.

[0020] During the pouring process of the present invention, a part of the poured concrete falls along the connecting pipe, and finally a part of the concrete can fall onto the baffle. The falling position of the concrete and the rotation center of the blocking block are not on the same straight line. Finally, the baffle at this time will rotate, the baffle will drive the blocking block at this time to rotate, and the blocking block drives the ejector rod to rotate. At this time, the ejector rod drives the positioning plate to rotate. At this time, the positioning plate can rotate in the locking groove, and finally the positioning plate is clamped in the locking groove, so that the two assembled precast wall bodies are in a locked state. Then when the concrete solidifies, the two precast wall bodies will not move, ensuring that the poured concrete can reach the required strength.

[0021] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings:

[0023] Figure 1 is a three-dimensional structural schematic diagram of a self-locking column joint prefabricated diaphragm wall;

[0024] Figure 2 is a lateral structural schematic diagram of a self-locking column joint prefabricated diaphragm wall;

[0025] Figure 3 is a three-dimensional view of the insertion cover of a self-locking column joint prefabricated diaphragm wall;

[0026] Figure 4 is a sectional view at the insertion cover of a self-locking column joint prefabricated diaphragm wall;

[0027] Figure 5 is Figure 4 the enlarged view at A in

[0028] Figure 6 is a sectional view at the positioning sleeve of a self-locking column joint prefabricated diaphragm wall Figure 1 ;

[0029] Figure 7 is a sectional view at the positioning sleeve of a self-locking column joint prefabricated diaphragm wall Figure 2 ;

[0030] Figure 8 is a lateral view of the precast wall of a self-locking column joint prefabricated diaphragm wall;

[0031] Figure 9 is a partial sectional view of a self-locking column joint prefabricated diaphragm wall;

[0032] Figure 10 is Figure 9 the enlarged view at B in

[0033] In the figure:

[0034] 101, precast wall;

[0035] 200, Steel bar expansion unit; 201, Insert cover; 2011, Mounting plate; 2012, Through hole; 2013, Notch; 202, Longitudinal steel bar; 2021, First connecting sleeve; 2022, First locking bolt; 203, Thrust rod; 2031, Positioning sleeve; 2032, Stopper; 2033, Push rod; 2034, Synchronous support; 2035, Slide bar; 2036, Return spring; 2037, Synchronous plate; 204, Flipping plate; 2041, Second connecting sleeve; 2042, Second locking bolt; 2043, Expanded steel bar; 2044, Fixed rod; 2045, Fixed seat; 2046, Torsion spring; 2047, Rocker arm; 2048, Strip-shaped groove;

[0036] 300, Pouring locking unit; 301, Positioning plate; 302, Insertion hole; 3021, Pouring chamber; 3022, Pouring passage; 3023, Pouring port; 303, Locking groove; 3031, Cover plate; 3032, Oval through hole; 3033, Blocking block; 304, Locking chamber; 3041, Baffle; 3042, Connecting pipe; 3043, Receiving hopper; 3044, Positioning rod. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0038] Embodiment 1, as Figures 1 to 10 shown, a self-locking column type joint prefabricated underground diaphragm wall includes a precast wall 101 and a steel bar expansion unit 200 and a pouring locking unit 300 installed on both sides of the precast wall 101.

[0039] The steel bar extension unit 200 includes three pairs of insertion covers 201. The three pairs of insertion covers 201 are installed on the side wall of the precast wall 101, and the three pairs of insertion covers 201 are not in the same vertical plane. A number of pairs of longitudinal steel bars 202 are installed on the end faces of the three pairs of insertion covers 201. One end of each longitudinal steel bar 202 is placed in the inner cavity of the insertion cover 201. A ejector rod 203 is movably installed on each pair of insertion covers 201. One end of the ejector rod 203 is movably inserted into a positioning sleeve 2031 installed inside the insertion cover 201. A stopper 2032 is slidably arranged inside the positioning sleeve 2031. One end of the stopper 2032 is connected to the ejector rod 203. A push rod 2033 is rotatably installed at the other end of the stopper 2032. A synchronous bracket 2034 is installed on the push rod 2033. A synchronous plate 2037 is installed on the synchronous bracket 2034. Four pairs of turning plates 204 are rotatably installed around each pair of insertion covers 201. A number of pairs of extension steel bars 2043 are installed on each pair of turning plates 204. A rocker arm 2047 is installed at the rotation center of the turning plate 204. The rocker arm 2047 is slidably connected to the synchronous plate 2037. The synchronous plate 2037 horizontally slides to drive the rocker arm 2047 and the extension steel bars 2043 to rotate by 90 degrees. One end of the extension steel bars 2043 after rotating by 90 degrees is placed in the inner cavity of the insertion cover 201. When the two precast walls 101 are inserted into each other, the ejector rod 203 at this time will be squeezed. The ejector rod 203 drives the stopper 2032 to slide inside the positioning sleeve 2031, thereby driving the push rod 2033 and the synchronous bracket 2034 to slide. The synchronous plate 2037 on the synchronous bracket 2034 drives the rocker arm 2047 to rotate. The turning plate 204 on the rocker arm 2047 drives the extension steel bars 2043 to rotate, making the extension steel bars 2043 become vertical. At this time, the longitudinal steel bars 202 and the extension steel bars 2043 improve the structural strength of the pouring position. And a part of the extension steel bars 2043 and the longitudinal steel bars 202 is located inside the insertion cover 201. After the insertion cover 201 is poured later, the insertion cover 201 and the outer layer of concrete can be tightly connected together, which is convenient to improve the structural strength after pouring.

[0040] The pouring locking unit 300 includes a positioning plate 301. The positioning plate 301 is oval-shaped, and the positioning plate 301 is adapted to a locking groove 303 formed on the side wall of the other end of the precast wall 101. A shielding plate 3031 is connected to the locking groove 303. An oval through-hole 3032 is installed on the shielding plate 3031, and the oval through-hole 3032 is adapted to the positioning plate 301. The insertion cover 201 is adapted to a pouring chamber 3021 formed on the side wall of the precast wall 101. A communicating pipe 3042 is installed on the positioning sleeve 2031. The communicating pipe 3042 and the center of the blocking block 2032 are not on the same straight line, and the communicating pipe 3042 communicates with a locking cavity 304 formed on the inner side wall of the blocking block 2032. A number of pairs of baffle plates 3041 are installed around the inside of the locking cavity 304. During the pouring process, a part of the poured concrete falls along the communicating pipe 3042, and finally a part of the concrete can fall onto the baffle plates 3041. The concrete feeding position and the rotation center of the blocking block 2032 are not on the same straight line. Finally, the baffle plates 3041 at this time will rotate, the baffle plates 3041 will drive the blocking block 2032 at this time to rotate, and the blocking block 2032 drives the ejector rod 203 to rotate. At this time, the ejector rod 203 drives the positioning plate 301 to rotate. At this time, the positioning plate 301 can rotate in the locking groove 303. Finally, the positioning plate 301 is clamped in the locking groove 303, so that the two assembled precast walls 101 are in a locked state. Then, when the concrete solidifies, the two precast walls 101 will not move, ensuring that the poured concrete can reach the required strength.

[0041] As Figures 1 to 10 shown, in the specific implementation, an installation plate 2011 is welded on the side wall of the insertion cover 201. The installation plate 2011 is integrally poured with the precast wall 101. A through-hole 2012 is formed on the insertion cover 201. The through-hole 2012 communicates with the inner chamber of the insertion cover 201. Through the installation plate 2011, the precast wall 101 and the insertion cover 201 can be firmly connected together, and the through-hole 2012 facilitates the flow of the later-poured concrete, so that the inside of the insertion cover 201 is filled with concrete.

[0042] As Figures 1 to 10 shown, further, a first connecting sleeve 2021 is inserted through the end face of the insertion cover 201. A corresponding longitudinal steel bar 202 is movably inserted into the first connecting sleeve 2021. A first locking bolt 2022 is rotatably installed on the first connecting sleeve 2021, and the end of the first locking bolt 2022 is in close contact with the longitudinal steel bar 202. The first locking bolt 2022 and the first connecting sleeve 2021 are used to position and lock the longitudinal steel bar 202. The length of the longitudinal steel bar 202 located outside the insertion cover 201 is less than the length of the ejector rod 203 located outside the insertion cover 201. During the installation process, the ejector rod 203 can first be pressed against the assembled precast wall 101, and the ejector rod 203 will move inward by compression.

[0043] Example 2, different from Example 1 in that: As Figures 1 to 10 shown, the stopper 2032 is in close contact with the inner wall of the positioning sleeve 2031, and a return spring 2036 is sleeved on the side wall of the push rod 2033 located in the inner cavity of the positioning sleeve 2031. One end of the return spring 2036 is clamped on the inner wall of the positioning sleeve 2031, and the other end of the return spring 2036 is clamped on the side wall of the stopper 2032. When the ejector rod 203 moves along the positioning sleeve 2031, at this time, the stopper 2032 at the end of the ejector rod 203 slides synchronously, and the stopper 2032 squeezes the internal return spring 2036 at this time, facilitating the later reset operation through the return spring 2036.

[0044] As Figures 1 to 10 shown, in the specific implementation, a second connecting sleeve 2041 is welded on each pair of turning plates 204. An extension steel bar 2043 is movably inserted through the inside of the second connecting sleeve 2041. A second locking bolt 2042 is screwed and installed on the surface of the second connecting sleeve 2041, and the bottom of the second locking bolt 2042 is in close contact with the extension steel bar 2043. The second locking bolt 2042 and the second connecting sleeve 2041 fixedly install the extension steel bar 2043.

[0045] As Figures 1 to 10 shown, further, a pair of fixing rods 2044 are installed on the surface of each pair of turning plates 204. A fixing seat 2045 is rotatably installed at the ends of the pair of fixing rods 2044. The fixing seat 2045 is welded on the surface of the insertion cover 201. A torsion spring 2046 is installed at the rotation center of the fixing rod 2044. One end of the torsion spring 2046 is clamped on the fixing seat 2045, and the other end of the torsion spring 2046 is clamped on the fixing rod 2044. A rocker arm 2047 is installed on the rotating shaft of the pair of fixing rods 2044. The rocker arm 2047 movably passes through a notch 2013 opened on the surface of the insertion cover 201. The pair of rocker arms 2047 are in an inclined state, and a strip-shaped groove 2048 is opened on the surface of the pair of rocker arms 2047. A sliding rod 2035 is slidably arranged on the strip-shaped groove 2048. The sliding rod 2035 is connected to the synchronous plate 2037. The synchronous plate 2037 is placed in the gap between the pair of rocker arms 2047. During the sliding process of the sliding rod 2035, the sliding rod 2035 always slides on the rocker arm 2047 provided with the strip-shaped groove 2048, and the whole rocker arm 2047 will swing. The rocker arm 2047 drives the coaxial connected turning plate 204 to start turning. At this time, the extension steel bar 2043 on the turning plate 204 extends, and at this time, the torsion spring 2046 is twisted synchronously. The torsion spring 2046 facilitates the later reset, and the torsion spring 2046 synchronously limits the angle of the initial rocker arm 2047.

[0046] Example 3, different from Example 2 in that: As Figures 1 to 10As shown, in the specific implementation, three pairs of jacks 302 are provided on the side wall of the precast wall 101. Each pair of jacks 302 communicates with the corresponding pouring chamber 3021, and the diameter of the jack 302 is smaller than the diameter of the plug cover 201. Pouring passages 3022 are connected between several pairs of pouring chambers 3021. A pouring port 3023 is provided at the top of the precast wall 101, and the pouring port 3023 communicates with the top pouring chamber 3021. Concrete is poured into the pouring chamber 3021 through the pouring port 3023, and the pouring chambers 3021 at various positions are filled with concrete through the pouring passages 3022.

[0047] As Figures 1 to 10 shown, further, a blocking block 3033 is installed inside the locking groove 303. The blocking block 3033 is used to limit the rotation angle of the positioning plate 301. The connecting pipe 3042 movably penetrates through the plug cover 201. A receiving hopper 3043 is installed at the top of the connecting pipe 3042. A positioning rod 3044 is installed on the outer shell of the receiving hopper 3043, and the positioning rod 3044 communicates with the side wall of the plug cover 201. The width of the connecting pipe 3042 is greater than the length of the locking cavity 304.

[0048] The implementation principle of the self-locking column type joint and prefabricated assembled underground continuous wall of the present invention is as follows:

[0049] When assembly is required, the operator needs to insert two precast walls 101 into each other, so that the plug covers 201 and the matching jacks 302 distributed alternately on the precast walls 101 are inserted together, and then concrete is poured later to achieve the connection purpose. Because the above-mentioned plug covers 201 are not on the same straight line, multiple plug covers 201 can form a triangle, and the structural strength at the connection of the equipment can be improved through the triangle. When the structure is subjected to external forces such as wind force and seismic force, the triangular shape can effectively resist deformation. Compared with the structure with connection points on the same straight line, this non-linearly distributed connection point can make the structure more stable and not easily distorted or collapsed. And when the connection points are not on the same straight line, the natural vibration frequency and vibration mode of the building structure become more complex. Different connection point distributions will result in different stiffness distributions of the structure, making it difficult for the structure to fully match the frequency of seismic waves under the action of seismic waves, thereby reducing the possibility of resonance and making it safer to use.

[0050] During the insertion process of the socket 201 into the mating jack 302, the positioning plate 301 at the end of the ejector rod 203 is tightly pressed into the locking groove 303. As the precast wall 101 with the jack 302 moves, the ejector rod 203 moves along the positioning sleeve 2031, and the internal stopper 2032 slides synchronously. The stopper 2032 squeezes the internal return spring 2036 at this time, facilitating the later reset operation. After the stopper 2032 moves, the push rod 2033 on the stopper 2032 slides outwards, the synchronous bracket 2034 on the push rod 2033 moves, and the synchronous plate 2037 on the synchronous bracket 2034 drives the slide bar 2035 to slide.

[0051] During the sliding process of the slide bar 2035, the slide bar 2035 always slides on the rocker arm 2047 with the strip groove 2048. The entire rocker arm 2047 will swing, and the rocker arm 2047 drives the coaxially connected turning plate 204 to start turning. At this time, the extended steel bars 2043 on the turning plate 204 extend. When the longitudinal steel bars 202 are in contact with the bottom of the pouring chamber 3021, the two precast walls 101 stop moving. At this time, the extended steel bars 2043 and the longitudinal steel bars 202 fill the entire pouring chamber 3021, and a part of the extended steel bars 2043 and the longitudinal steel bars 202 are located inside the socket 201. After the socket 201 is poured later, the socket and the outer concrete can be tightly connected together, facilitating the improvement of the structural strength after pouring.

[0052] After the above structure is inserted, the operator needs to inject concrete into the pouring chamber 3021 through the pouring port 3023 so that the steel bars can be wrapped by the concrete. The pouring passage 3022 is used to connect different pouring chambers 3021, and finally the two precast walls can be connected together.

[0053] During the pouring process, a part of the poured concrete will fall into the receiving hopper 3043. Through the receiving hopper 3043, it can be ensured that the concrete can fall along the connecting pipe 3042. Finally, a part of the concrete can fall onto the baffle 3041. The falling position of the concrete and the rotation center of the stopper 2032 are not on the same straight line. Finally, the baffle 3041 will rotate at this time. The baffle 3041 will drive the stopper 2032 to rotate at this time, and the stopper 2032 drives the ejector rod 203 to rotate. At this time, the ejector rod 203 drives the positioning plate 301 to rotate. At this time, the positioning plate 301 can rotate in the locking groove 303. Finally, the positioning plate 301 will be blocked by the blocking block 3033. Then the positioning plate 301 can be tightly clamped with the locking groove 303. At this time, the socket 201 and the jack 302 can be assembled together, facilitating that their positions will not move during the later pouring and solidification process, ensuring the stability of the structure after pouring.

Claims

1. A self-clamping column joint assembled prefabricated underground continuous wall, comprising a prefabricated wall body (101) and a steel bar expansion unit (200) and a casting locking unit (300) installed on both sides of the prefabricated wall body (101), characterized in that: The steel bar expansion unit (200) comprises three pairs of plug covers (201), the three pairs of the plug covers (201) are installed on the side walls of the prefabricated wall (101), and the three pairs of the plug covers (201) are not located on the same vertical plane, and a plurality of pairs of longitudinal steel bars (202) are installed on the end surfaces of the three pairs of the plug covers (201), one end of the longitudinal steel bars (202) is placed in the inner cavity of the plug covers (201), and a top rod (203) is movably installed on each pair of the plug covers (201); One end of the push rod (203) is movably inserted into a positioning sleeve (2031) installed inside the plug cover (201), a stopper (2032) is slidably arranged inside the positioning sleeve (2031), and one end of the stopper (2032) is connected to the push rod (2033), and the other end of the stopper (2032) is rotatably mounted with a push rod (2033), and a synchronous bracket (2034) is installed on the push rod (2033), and a synchronous plate (2037) is installed on the synchronous bracket (2034), and four pairs of flip plates (204) are rotatably installed around each pair of the plug covers (201), and each pair of the flip plates (204) is installed with a plurality of pairs of expansion steel bars (2043), and A rocker arm (2047) is installed at the rotation center of the flip plate (204), and the rocker arm (2047) is slidably connected to the synchronous plate (2037), and the synchronous plate (2037) slides horizontally to drive the rocker arm (2047) and the extended steel bar (2043) to rotate ninety degrees, and one end of the extended steel bar (2043) rotated ninety degrees is placed in the inner cavity of the plug cover (201); a mounting plate (2011) is welded to the side wall of the plug cover (201), and the mounting plate (2011) and the prefabricated wall (101) are integrally cast, and a through hole (2012) is opened on the plug cover (201), and the through hole (2012) is communicated with the internal cavity of the plug cover (201); The casting locking unit (300) comprises a positioning plate (301), the positioning plate (301) is elliptical, and the positioning plate (301) and a locking groove (303) provided on the side wall at the other end of the prefabricated wall (101) are mutually matched, and a shielding plate (3031) is connected to the locking groove (303), an elliptical through hole (3032) is installed on the shielding plate (3031), and the elliptical through hole (3032) is matched with the positioning plate (301), and the plug cover (201) and a casting chamber (3021) provided on the side wall of the prefabricated wall (101) are mutually matched.

2. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 1, characterized in that: A first connecting sleeve (2021) is installed through the end surface of the plug cover (201), a corresponding longitudinal steel bar (202) is movably inserted inside the first connecting sleeve (2021), a first locking bolt (2022) is rotatably installed on the first connecting sleeve (2021), and the end of the first locking bolt (2022) is tightly fitted with the longitudinal steel bar (202), and the length of the longitudinal steel bar (202) located outside the plug cover (201) is less than the length of the top rod (203) located outside the plug cover (201).

3. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 2, characterized in that: The stopper (2032) is tightly fitted to the inner wall of the positioning sleeve (2031), and a return spring (2036) is sleeved on the side wall of the push rod (2033) located in the inner cavity of the positioning sleeve (2031), one end of the return spring (2036) is clamped on the inner wall of the positioning sleeve (2031), and the other end of the return spring (2036) is clamped on the side wall of the stopper (2032).

4. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 1, characterized in that: A second connecting sleeve (2041) is welded on each pair of the flip plates (204), an extended steel bar (2043) is movably inserted and inserted inside the second connecting sleeve (2041), a second locking bolt (2042) is screwed and installed on the surface of the second connecting sleeve (2041), and the bottom of the second locking bolt (2042) is tightly fitted with the extended steel bar (2043).

5. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 4, characterized in that: A pair of fixing rods (2044) are mounted on the surface of each pair of flip plates (204); fixing seats (2045) are rotatably mounted on the ends of the pair of fixing rods (2044); the fixing seats (2045) are welded and arranged on the surface of the plug cover (201); a torsion spring (2046) is mounted on the rotation center of the fixing rods (2044); one end of the torsion spring (2046) is clamped on the fixing seat (2045), and the other end of the torsion spring (2046) is clamped on the fixing rod (2044).

6. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 5, characterized in that: A rocker arm (2047) is installed on the rotating shaft of a pair of fixed rods (2044), and the rocker arm (2047) movably penetrates a notch (2013) opened on the surface of the plug cover (201), the pair of rocker arms (2047) are in an inclined state, and a strip groove (2048) is opened on the surface of the pair of rocker arms (2047), and a slide bar (2035) is slidably arranged on the strip groove (2048), and the slide bar (2035) is connected to a synchronous plate (2037), and the synchronous plate (2037) is placed in the gap between the pair of rocker arms (2047).

7. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 6, characterized in that: The side wall of the prefabricated wall (101) is provided with three pairs of jacks (302), each pair of the jacks (302) is interconnected with a corresponding casting chamber (3021), and the diameter of the jacks (302) is smaller than the diameter of the plug cover (201), and a casting passage (3022) is connected between several pairs of the casting chambers (3021), and a casting port (3023) is provided on the top of the prefabricated wall (101), and the casting port (3023) is interconnected with the casting chamber (3021) on the top.

8. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 7, characterized in that: A blocking block (3033) is installed inside the locking groove (303), and the blocking block (3033) is used to limit the rotation angle of the positioning plate (301).

9. The self-clamping column joint assembled prefabricated underground continuous wall according to claim 8, characterized in that: A connecting pipe (3042) is installed on the positioning sleeve (2031), the centers of the connecting pipe (3042) and the stopper (2032) are not in the same straight line, the connecting pipe (3042) and the locking cavity (304) opened on the inner wall of the stopper (2032) are mutually connected, and a plurality of pairs of baffles (3041) are installed around the inside of the locking cavity (304); the connecting pipe (3042) movably passes through the plug cover (201), a material receiving hopper (3043) is installed on the top of the connecting pipe (3042), a positioning rod (3044) is installed on the outer shell of the material receiving hopper (3043), and the positioning rod (3044) is mutually connected with the side wall of the plug cover (201), and the width of the connecting pipe (3042) is greater than the length of the locking cavity (304).

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