Fabricated underground continuous wall structure and construction method thereof

Abstract

The application discloses an assembled underground continuous wall structure and a construction method thereof, and comprises a plurality of anchoring members, a group of wall units being spliced between every two anchoring members, the wall unit comprising a retaining wall body, a clamping block being fixedly installed on both sides of the retaining wall body and being clamped with a splicing groove, a group of linearly arrayed partitions being fixedly installed in the retaining wall body, a group of regularly distributed grouting chambers being arranged in the retaining wall body by the partitions, and a connecting clasp being fixedly installed on the bottom surface of the retaining wall body and being clamped with the grouting chamber corresponding to the position of each grouting chamber. The anchoring arm is provided in an outward spreading structure, so that the anchoring strength of the anchoring cylinder to the concrete slurry is effectively improved in the mode of improving the anchoring area, and the structural stability of the assembled underground continuous wall is effectively improved in the mode of anchoring by improving the anchoring strength of the anchoring cylinder.

Description

Technical Field

[0001] This invention relates to the field of construction technology for foundation pit retaining systems, and more specifically, to prefabricated underground continuous wall structures and their construction methods. Background Technology

[0002] Diaphragm walls are playing an increasingly important role in foundation pit support systems. Considering factors such as construction period, construction efficiency, and reduction of construction noise, prefabricated diaphragm wall structures and their construction methods have been increasingly promoted in recent years. Existing prefabricated diaphragm wall construction methods are diverse, with varying construction steps. For example, patent document CN115450199A discloses a method for constructing prefabricated diaphragm walls using rectangular steel sleeves, including the following steps: prefabricating rectangular reinforced concrete precast wall panels; marking the construction line on the side of the foundation pit retaining wall on the ground; using a rotary drilling rig to press the steel casing to the predetermined pile driving position on the construction line; drilling pile holes to a predetermined depth using the auger rod of the rotary drilling rig, or drilling pile holes to a predetermined depth using mud wall construction. The above-mentioned prefabricated diaphragm wall structures and their construction methods further improve the load-bearing capacity and safety performance of the diaphragm wall. However, the above technical solutions are not convenient for improving the bottom stability of the prefabricated wall and the stability of the connection between two unit walls through anchoring. Based on this, the present invention provides a prefabricated diaphragm wall structure and its construction method to solve the problems mentioned in the background art. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a prefabricated diaphragm wall structure and its construction method. By improving the anchoring strength of the anchor cylinder, the structural stability of the prefabricated diaphragm wall can be effectively improved through the anchoring method.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a prefabricated underground continuous wall structure, comprising;

[0007] Several anchors, with a set of wall units spliced ​​between each pair of anchors;

[0008] Wall unit, which includes the retaining wall body;

[0009] Both sides of the retaining wall body are fixedly installed with locking blocks that engage with the splicing groove. Inside the retaining wall body, a set of partitions arranged in a linear array are fixedly installed. Inside the retaining wall body, a set of regularly distributed grouting chambers are set up with the partitions as the dividers.

[0010] The bottom surface of the retaining wall body and the position corresponding to each grouting chamber are fixedly installed with connecting rings that connect to the grouting chamber. A set of regularly distributed grout-permeable external holes are opened on both sides of the retaining wall body and inside each partition. The grouting chambers are interconnected through the grout-permeable external holes. A set of clamping arms are installed inside the retaining wall body.

[0011] As a preferred technical solution, the anchor includes an anchor cylinder, a splicing frame is fixedly installed on the top surface of the anchor cylinder, a set of accommodating holes arranged in a circumferential array are opened inside the anchor cylinder, an anchor arm is hinged to the inner wall of each accommodating hole, a swivel tube is rotatably connected to the inner wall of the splicing frame, a transmission screw is fixedly installed at the bottom of the swivel tube, a drive seat is tractively connected to the circumferential side of the transmission screw at a position corresponding to the inner side of the anchor cylinder, a connecting rod a is hinged between the drive seat and the opposite surface of each anchor arm, a grouting channel with two open ends is fixedly opened inside the swivel tube, the bottom end of the anchor cylinder is open, two symmetrically arranged splicing slots are opened inside the splicing frame and are engaged with the wall unit, an air-filled clamping component is fixedly installed inside the splicing frame, and several regularly distributed grout-permeable inner holes communicating with the grouting channel are opened inside the two splicing slots and inside the swivel tube.

[0012] As a preferred technical solution, the inflatable clamping component includes a pressurized cavity opened inside the splicing frame, a valve core communicating with the pressurized cavity is fixedly installed on the top surface of the splicing frame, and pressure-drum clamps communicating with the pressurized cavity are fixedly installed on both sides of the splicing frame, with friction internal textures evenly distributed on the surface of the pressure-drum clamps.

[0013] As a preferred technical solution, the retaining wall body has grout leakage holes fixedly opened on both sides and corresponding to the position of each grouting chamber, which are connected to the grouting chamber. The shape of the connecting ring is adapted to the inner cavity shape of the grouting chamber.

[0014] As a preferred technical solution, the splicing groove is a "T" shaped groove, and the shape of the card block is adapted to the shape of the splicing groove.

[0015] As a preferred technical solution, two symmetrically arranged side clamps are fixedly installed on the surface of the retaining wall body and at the positions corresponding to the two clamping blocks. The two side clamps are respectively arranged on both sides of the splicing frame, and the interior of the side clamps is fixedly provided with friction outer texture that cooperates with the friction inner texture.

[0016] As a preferred technical solution, a set of locking screw holes are provided inside the side clamping plate, and a locking bolt is threaded into the inner wall of each locking screw hole. Two symmetrically arranged locking areas are fixedly provided on both sides of the splicing frame, and locking grooves that cooperate with the locking bolts are evenly distributed inside the locking areas.

[0017] As a preferred technical solution, the clamping arm components each include a slide rail formed inside the retaining wall body. A transmission clamping seat is slidably connected to the inner wall of the slide rail. Two symmetrically arranged locking walls are hinged to the inner wall of the slide rail. A connecting rod b is hinged between the transmission clamping seat and the opposite surfaces of the two locking walls. A pressure block is fixedly installed on the bottom surface of the retaining wall body at a position directly below the transmission clamping seat. A positioning groove that mates with the pressure block is fixedly opened on the top surface of the transmission clamping seat. An anti-compression spring is installed between the transmission clamping seat and the opposite surfaces of the slide rail.

[0018] As a preferred technical solution, a set of limiting grooves is provided on the top surface of the transmission clamp, and a stop bar that engages with the limiting groove is fixedly installed on the inner wall of the slide and at the position corresponding to each limiting groove.

[0019] As a preferred technical solution, the construction method for prefabricated diaphragm wall structures includes the following steps:

[0020] SS001, Precast, wall unit of precast reinforced concrete underground continuous wall structure;

[0021] SS002. Site setup: After the selected construction site is fenced off, the construction site is leveled. After the site is leveled, the construction lines and depth of the trench area are marked in the construction site according to the length and depth requirements of the underground continuous wall.

[0022] SS003, Trench excavation: Trench excavation shall be carried out at the construction site after the construction line is drawn in step SS002, until the length and depth of the trench meet the preset requirements.

[0023] SS004. Trench wall construction: Apply concrete slurry to the trench wall surface excavated in step SS003. After applying the concrete slurry, perform preliminary leveling of the concrete slurry. After preliminary leveling, roughen the concrete wall surface. After the roughened concrete wall surface has cured, the concrete trench wall will be formed.

[0024] SS005. Compact the bottom of the trench. Use a rammer to fully compact the bottom of the trench.

[0025] SS006 Anchor installation: Based on the required depth and length of the diaphragm wall, the number of anchors and the anchoring height are customized. After the number and height of anchors are determined, the spacing between each pair of anchors is customized according to the specifications of the wall unit. After the installation spacing is set, the spacing, height and angle between each anchor are locked using external scaffolding. After the anchors are positioned, the tops of each anchor are flush, the bottoms of each anchor are kept at a certain distance from the bottom of the trench, each anchor is set vertically and parallel, and the centers of each anchor are on the same straight line.

[0026] SS007. Grouting at the bottom of the trench: After the anchors are positioned, concrete grout is poured into the trench until the height of the concrete grout covers the anchor cylinder in the anchor. During the grouting at the bottom of the trench, a concrete vibrator is used to compact and homogenize the grout. After the concrete grout has solidified, the concrete base layer at the bottom of the trench is formed.

[0027] SS008, Wall assembly: Wall units are assembled sequentially from bottom to top between pairs of anchors;

[0028] After steps SS008 (locking and positioning), external pressure equipment is used to apply external force to compact the spliced ​​wall units. During compaction, the external pressure equipment generates a vibration source at a set frequency to ensure that the two wall units fit together fully. After compaction, under the applied force, multiple locking bolts are used to fix the uppermost wall unit to the anchor. After the wall unit is fixed with the locking bolts, an external air supply device is used to pressurize the inside of the anchor in a quantitative manner, thereby completing the synchronous internal pressurization clamping and fixing of each wall unit on the anchor.

[0029] After steps SS010 and SS009, grouting is performed from the top of the wall unit into the interior of the wall unit. After grouting, the top layer of grout surface is leveled and refined. After curing, a prefabricated underground continuous wall is formed.

[0030] (III) Beneficial Effects

[0031] Compared with the prior art, the present invention provides a prefabricated underground continuous wall structure and its construction method, which has the following beneficial effects.

[0032] 1. In this invention, when the concrete in the bottom of the trench is poured in one go, the operator drives the rotating pipe to make the anchor arm unfold from the inside of the receiving hole. After the anchor arm is unfolded, it penetrates into the concrete slurry. After the concrete slurry is cured, the outward structure of the anchor arm effectively improves the anchoring strength of the anchor tube by increasing the anchoring area. By improving the anchoring strength of the anchor tube, the structural stability of the prefabricated underground continuous wall can be effectively improved through the anchoring method.

[0033] 2. In this invention, after two wall units are fully fitted together, the pressure block applies sufficient pressure to the inside of the transmission clamp. After the transmission clamp is pressed, it drives the two locking arms to unfold outward. After the two locking arms unfold, they fully fit with the trench wall. When the locking arms fit with the trench wall, the position of a single wall unit is effectively locked. By achieving the locking effect between the wall unit and the trench wall, the stability of the wall unit during and after concrete pouring is effectively improved. Furthermore, by achieving the wall unit locking effect, the structural strength of the underground continuous wall can be effectively improved. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the prefabricated underground continuous wall structure of the present invention;

[0035] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A;

[0036] Figure 3 For the present invention Figure 1 A magnified schematic diagram of the local structure at point B;

[0037] Figure 4 This is a schematic diagram of the structure of the anchor of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the anchor arm and transmission screw of the present invention;

[0039] Figure 6 This is a structural schematic diagram of the wall unit of the present invention;

[0040] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point C in the middle;

[0041] Figure 8 This is a schematic diagram of the structure of the limiting groove and transmission clamp of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of the pressure block and connecting ring of the present invention.

[0043] In the diagram: 1. Wall unit; 11. Retaining wall body; 12. Clamping block; 13. Partition plate; 14. Grouting chamber; 15. Connecting ring; 16. Grouting hole; 17. Grout leakage hole; 18. Side clamping plate; 19. Locking screw hole; 110. Limiting groove; 111. Transmission clamp; 112. Locking arm; 113. Connecting rod b; 114. Pressure block; 115. Compression spring; 2. Anchor; 21. Anchor cylinder; 22. Splicing frame; 23. Anchor arm; 24. Rotary tube; 25. Transmission screw; 26. Drive seat; 27. Connecting rod a; 28. Grouting channel; 29. ​​Splicing groove; 210. Grouting hole; 211. Valve core; 212. Pressure bladder; 213. Locking area; 3. Locking bolt. Detailed Implementation

[0044] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0045] Please see Figure 1-9 The present invention is a prefabricated underground continuous wall structure, and the technical solution adopted is as follows: including;

[0046] Three anchors 2, and a set of wall units 1 are spliced ​​between each pair of anchors 2;

[0047] Anchor 2 includes anchor cylinder 21. A splicing frame 22 is fixedly installed on the top surface of anchor cylinder 21. A set of accommodating holes arranged in a circular array are opened inside anchor cylinder 21. An anchor arm 23 is hinged to the inner wall of each accommodating hole. A swivel tube 24 is rotatably connected to the inner wall of splicing frame 22. A transmission screw 25 is fixedly installed at the bottom of swivel tube 24. A drive seat 26 is drivenly connected to the circumferential side of the transmission screw 25 and the position corresponding to the inner side of anchor cylinder 21. A connecting rod a27 is hinged between the drive seat 26 and the opposite surface of each anchor arm 23.

[0048] When the concrete in the bottom of the trench is poured in one go, the operator drives the rotating tube 24 to make the anchor arm 23 unfold from the inside of the receiving hole. After the anchor arm 23 unfolds, it penetrates into the concrete slurry. After the concrete slurry solidifies, the outward structure of the anchor arm 23 effectively improves the anchoring strength of the anchor tube 21 by increasing the anchoring area.

[0049] The inside of the spiral tube 24 is fixedly provided with a grouting channel 28 with openings at both ends, the bottom end of the anchor tube 21 is open, the inside of the splicing frame 22 is provided with two symmetrically arranged splicing grooves 29 that are snapped into the wall unit 1, and the inside of the splicing frame 22 is fixedly provided with an inflatable clamping component.

[0050] The inflatable clamping component includes a pressurized cavity opened inside the splicing frame 22. A valve core 211 communicating with the pressurized cavity is fixedly installed on the top surface of the splicing frame 22. A pressure bladder 212 communicating with the pressurized cavity is fixedly installed on both sides of the splicing frame 22. Friction internal textures are evenly distributed on the surface of the pressure bladder 212.

[0051] When the wall unit 1 is in an unassembled state, the gas inside the pressurized cavity is fully vented, and the bulging clamp 212 fully retracts, which facilitates the rapid installation of the wall unit 1 on the splicing frame 22.

[0052] After the wall unit 1 is fully assembled, the external air supply equipment inflates the interior of the pressurized cavity through the valve core 211, and the pressure bladder 212 is fully inflated. After the pressure bladder 212 is inflated, it then clamps and limits the side clamping plate 18 in the wall unit 1.

[0053] The pressure bladder 212 is made of titanium alloy.

[0054] The interiors of the two splicing grooves 29 and the spiral tube 24 are provided with several regularly distributed grout-permeable inner holes 210 that are connected to the grouting channel 28.

[0055] The wall unit 1 includes a retaining wall body 11, and both sides of the retaining wall body 11 are fixedly installed with clips 12 that engage with the splicing groove 29;

[0056] The splicing groove 29 is a "T" shaped groove, and the shape of the locking block 12 is adapted to the shape of the splicing groove 29;

[0057] A set of partitions 13 arranged in a linear array are fixedly installed inside the retaining wall body 11. A set of regularly distributed grouting chambers 14 are set inside the retaining wall body 11, separated by a set of partitions 13. A connecting ring 15 is fixedly installed on the bottom surface of the retaining wall body 11 and at the position corresponding to each grouting chamber 14.

[0058] By setting the connecting ring 15, the connection stability of the two retaining wall bodies 11 after splicing is effectively guaranteed.

[0059] A set of regularly distributed grouting holes 16 are provided on both sides of the retaining wall body 11 and inside each partition 13. The two grouting chambers 14 are interconnected through the grouting holes 16. A set of clamping arms are installed inside the retaining wall body 11.

[0060] Each clamping arm includes a slide rail opened inside the retaining wall body 11. A transmission clamping seat 111 is slidably connected to the inner wall of the slide rail. Two symmetrically arranged locking arms 112 are hinged to the inner wall of the slide rail. A connecting rod b113 is hinged between the transmission clamping seat 111 and the opposite surface of the two locking arms 112. A pressure block 114 is fixedly installed on the bottom surface of the retaining wall body 11 and at the position directly below the transmission clamping seat 111. A positioning groove that cooperates with the pressure block 114 is fixedly opened on the top surface of the transmission clamping seat 111. An anti-compression spring 115 is installed between the transmission clamping seat 111 and the opposite surface of the slide rail.

[0061] The top surface of the transmission clamp 111 is provided with a set of limiting grooves 110, and the inner wall of the slide is fixedly installed with a stop bar that engages with the limiting groove 110 at the corresponding position of each limiting groove 110.

[0062] By setting the limiting groove 110 and the stop bar, the maximum movable position of the transmission clamp 111 in the non-forced state is effectively limited. When the transmission clamp 111 is in the non-forced state, the two wall locking arms 112 are hidden in the slide.

[0063] After the two wall units 1 are fully fitted together, the pressure block 114 applies sufficient pressure to the inside of the transmission clamp 111. After the transmission clamp 111 is pressed, it drives the two locking arms 112 to unfold outward. After the two locking arms 112 unfold, they fully fit with the trench wall. When the locking arms 112 fit with the trench wall, the position of the individual wall unit 1 is effectively locked. By achieving the locking effect between the wall unit 1 and the trench wall, the stability of the wall unit 1 during and after concrete pouring is effectively improved. Furthermore, by achieving the locking effect of the wall unit 1, the structural strength of the underground continuous wall can be effectively improved.

[0064] Both sides of the retaining wall body 11 and corresponding to the position of each grouting chamber 14 are fixedly provided with grout leakage holes 17 that communicate with the grouting chamber 14, and the shape of the connecting ring 15 is adapted to the inner cavity shape of the grouting chamber 14.

[0065] Two symmetrically arranged side clamps 18 are fixedly installed on the surface of the retaining wall body 11 and at the positions corresponding to the two clamps 12. The two side clamps 18 are respectively arranged on both sides of the splicing frame 22, and the interior of the side clamps 18 is fixedly provided with friction outer texture that matches the friction inner texture.

[0066] The side plate 18 has a set of locking screw holes 19 inside. Each locking screw hole 19 has a locking bolt 3 threaded into its inner wall. The two sides of the splicing frame 22 are fixedly provided with two symmetrically arranged locking areas 213. The locking areas 213 have locking grooves that cooperate with the locking bolts 3 evenly distributed inside.

[0067] After the secondary grouting is completed, the external pressure equipment presses the spliced ​​wall unit 1 to ensure that the two wall units 1 fit together fully. Under external pressure, the locking bolt 3 is installed in the locking screw hole 19, thereby effectively limiting the position of the wall unit 1 on the splicing frame 22.

[0068] Construction method of prefabricated diaphragm wall structure:

[0069] SS001, Precast, wall unit 1 of precast reinforced concrete underground continuous wall structure;

[0070] SS002. Site setup: After the selected construction site is fenced off, the construction site is leveled. After the site is leveled, the construction lines and depth of the trench area are marked in the construction site according to the length and depth requirements of the underground continuous wall.

[0071] SS003, Trench excavation: Trench excavation shall be carried out at the construction site after the construction line is drawn in step SS002, until the length and depth of the trench meet the preset requirements.

[0072] SS004. Trench wall construction: Apply concrete slurry to the trench wall surface excavated in step SS003. After applying the concrete slurry, perform preliminary leveling of the concrete slurry. After preliminary leveling, roughen the concrete wall surface. After the roughened concrete wall surface has cured, the concrete trench wall will be formed.

[0073] SS005. Compact the bottom of the trench. Use a rammer to fully compact the bottom of the trench.

[0074] SS006 Anchor installation: Based on the required depth and length of the diaphragm wall, the number and anchoring height of the anchor 2 are customized. After the number and anchoring height of the anchor 2 are determined, the spacing between each pair of anchor 2 is customized according to the specifications of the wall unit 1. After the installation spacing is set, the spacing, height and angle between each anchor 2 are locked using external scaffolding. After the anchor 2 is positioned, the top of each anchor 2 is flush, the bottom of each anchor 2 is kept at a certain distance from the bottom of the trench, each anchor 2 is set vertically and parallel, and the center of each anchor 2 is on the same straight line.

[0075] SS007. Grouting at the bottom of the trench: After the anchor 2 is positioned, concrete grout is poured into the trench until the height of the concrete grout covers the anchor cylinder 21 in the anchor 2. When grouting at the bottom of the trench, a concrete vibrator is used to compact and homogenize the grout. After the concrete grout has solidified, the concrete base layer at the bottom of the trench is formed.

[0076] SS008, Wall assembly: The wall units 1 are assembled sequentially from bottom to top between two pairs of anchors 2;

[0077] After steps SS009 and SS008, external pressure equipment is used to apply external force to compact the spliced ​​wall unit 1. During compaction, the external pressure equipment generates a vibration source at a set frequency to ensure that the two wall units 1 fit together fully. After compaction, under the applied force, multiple locking bolts 3 are used to fix the uppermost wall unit 1 to the anchor 2. After the wall unit 1 is fixed by the locking bolts 3, an external air supply device is used to pressurize the inside of the anchor 2 in a quantitative manner, thereby completing the synchronous internal pressurization clamping and fixing of each wall unit 1 on the anchor 2.

[0078] After steps SS010 and SS009, grouting is performed from the top of wall unit 1 into the interior of wall unit 1. After grouting, the top layer of grout surface is leveled and refined. After curing, a prefabricated underground continuous wall is formed.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A fabricated diaphragm wall structure, characterised in that, Comprise; A plurality of anchor (2), The anchor (2) comprises an anchor barrel (21), the top surface of the anchor barrel (21) is fixedly installed with a splicing frame (22), the inside of the anchor barrel (21) is provided with a group of accommodation holes in circumferential array, the inner wall of each accommodation hole is hingedly connected with an anchor arm (23), the inner wall of the splicing frame (22) is rotatably connected with a spiral tube (24), the bottom of the spiral tube (24) is fixedly installed with a transmission screw (25), the side surface of the transmission screw (25) and the position corresponding to the inside of the anchor barrel (21) are drivingly connected with a driving seat (26), the driving seat (26) and the opposite surface of each anchor arm (23) are hingedly connected with a connecting rod a (27), the inside of the spiral tube (24) is fixedly provided with a two-end opening grouting flow channel (28), the bottom end of the anchor barrel (21) is open, the inside of the splicing frame (22) is provided with two symmetrical splicing grooves (29) which are clamped with the wall unit (1), the inside of the splicing frame (22) is fixedly provided with an inflation clamping piece, the inside of the two splicing grooves (29) and the inside of the spiral tube (24) are provided with a plurality of regularly distributed grouting inner holes (210) which are communicated with the grouting flow channel (28); Two of the anchor (2) are spliced with a group of wall units (1); The wall unit (1) comprises a retaining wall body (11); The two side surfaces of the retaining wall body (11) are fixedly installed with clamping blocks (12) which are clamped with the splicing grooves (29), the inside of the retaining wall body (11) is fixedly installed with a group of partition plates (13) in linear array, the inside of the retaining wall body (11) is provided with a group of regularly distributed grouting chambers (14) which are separated by a group of partition plates (13); The bottom surface of the retaining wall body (11) and the position corresponding to each grouting chamber (14) are fixedly installed with connecting snap rings (15) which are clamped with the grouting chambers (14), the two sides of the retaining wall body (11) and the inside of each partition plate (13) are provided with a group of regularly distributed grouting outer holes (16), two of the grouting chambers (14) are communicated through the grouting outer holes (16), the inside of the retaining wall body (11) is installed with a group of clamping arm pieces.

2. The assembled diaphragm wall structure according to claim 1, wherein: The inflation clamping piece comprises a pressurized cavity which is provided in the inside of the splicing frame (22), the top surface of the splicing frame (22) is fixedly installed with a valve core (211) which is communicated with the pressurized cavity, the two side surfaces of the splicing frame (22) are fixedly installed with pressure drum clamping capsules (212) which are communicated with the pressurized cavity, the surfaces of the pressure drum clamping capsules (212) are uniformly provided with friction inner lines.

3. The assembled diaphragm wall structure according to claim 1, wherein: The two side surfaces of the retaining wall body (11) and the position corresponding to each grouting chamber (14) are fixedly provided with grouting holes (17) which are communicated with the grouting chambers (14), the shape of the connecting snap ring (15) is matched with the shape of the inner cavity of the grouting chamber (14).

4. The assembled diaphragm wall structure of claim 1, wherein: The splicing groove (29) is a "T" shaped groove, the shape of the clamping block (12) is matched with the shape of the splicing groove (29).

5. The assembled diaphragm wall structure according to claim 3, wherein: The surface of the retaining wall body (11) and the positions corresponding to the two clamping blocks (12) are fixedly provided with two symmetrically arranged side clamping plates (18), the two side clamping plates (18) are arranged on the two sides of the splicing frame (22), and the inner part of the side clamping plate (18) is fixedly provided with a friction outer thread matched with a friction inner thread.

6. The assembled diaphragm wall structure of claim 5, wherein: A group of locking screw holes (19) are arranged in the inner part of the side clamping plate (18), the inner wall of each locking screw hole (19) is threadedly matched with a locking bolt (3), and the two sides of the splicing frame (22) are fixedly provided with two symmetrically arranged locking areas (213), and the inner part of the locking area (213) is uniformly provided with a locking groove matched with the locking bolt (3).

7. The assembled diaphragm wall structure of claim 1, wherein: The clamping arm part comprises a slide channel arranged in the inner part of the retaining wall body (11), the inner wall of the slide channel is slidably connected with a transmission clamping seat (111), the inner wall of the slide channel is hingedly connected with two symmetrically arranged wall locking arms (112), the opposite surfaces of the transmission clamping seat (111) and the two wall locking arms (112) are hingedly connected with a connecting rod b (113), the bottom surface of the retaining wall body (11) and the position corresponding to the transmission clamping seat (111) are fixedly provided with a pressing block (114), the top surface of the transmission clamping seat (111) is fixedly provided with a positioning groove matched with the pressing block (114), and the opposite surfaces of the transmission clamping seat (111) and the slide channel are provided with a compression spring (115).

8. The assembled diaphragm wall structure of claim 7, wherein: The top surface of the transmission clamping seat (111) is provided with a group of limiting stop grooves (110), and the inner wall of the slide channel and the position corresponding to each limiting stop groove (110) are fixedly provided with a stop bar matched with the limiting stop groove (110).

9. The construction method of the assembled diaphragm wall structure according to any one of claims 1 to 8, characterized in that, The method comprises the following steps: SS001, prefabrication, prefabricating a wall unit (1) of an underground continuous wall of a reinforced concrete structure; SS002, site construction, constructing a construction enclosure at a selected construction site, leveling the construction site after the construction enclosure is established, and determining the construction line and depth of the trenching area at the construction site according to the construction length and depth requirement of the underground continuous wall; SS003, trench excavation, excavating a trench at the construction site determined in the step S002 until the length and depth of the trench meet the preset requirements; SS004, trench wall establishment, applying a concrete slurry to the wall surface of the trench excavated in the step S003, preliminarily leveling the concrete slurry, performing a roughening treatment on the concrete wall surface, and forming a concrete trench wall after the roughened concrete wall surface is solidified; SS005, trench bottom tamping, tamping the trench bottom by using a tamping machine; SS006, anchor installation, according to the construction depth requirement and length requirement of the underground continuous wall, the installation quantity and anchorable height of the anchor (2) are customized, after the anchor (2) quantity and anchor height are determined, according to the specification of the wall unit (1), the spacing between two anchors (2) is customized, after the installation spacing is set, the spacing, height and angle between each anchor (2) are locked by external scaffolding, after the anchor (2) is positioned, the top end of each anchor (2) is flush, the bottom end of each anchor (2) maintains a certain spacing with the groove bottom, each anchor (2) is vertically and parallel arranged, and the center of each anchor (2) is on the same straight line; SS007, groove bottom grouting, after the anchor (2) is positioned, the inside of the trench is poured with concrete slurry once, until the height of the concrete slurry is higher than the anchor cylinder (21) in the anchor (2), when grouting the groove bottom, the concrete vibrator is used to vibrate and uniform the slurry, after the concrete slurry is solidified, the groove bottom concrete base is formed; SS008, wall assembly, the wall unit (1) is sequentially spliced from bottom to top between two anchors (2); SS009, locking and positioning, after the step of SS008, the spliced wall unit (1) is compacted by external pressure equipment, when compacting, the external pressure equipment generates vibration source at a set frequency, so that two wall units (1) are fully attached, after compacting, the uppermost wall unit (1) is fixed on the anchor (2) by using multiple locking bolts (3) in the force state, after the wall unit (1) is fixed by the locking bolt (3), the internal pressure of the anchor (2) is quantitatively supplied by using external air supply equipment, and then the synchronous internal pressure clamping and fixing of each wall unit (1) on the anchor (2) is completed; SS010, secondary grouting, after the step of SS009, the inside of the wall unit (1) is poured and cast from the top of the wall unit (1), after pouring and casting, the top surface of the top layer is treated, and after the casting is solidified, the assembled underground continuous wall is formed.

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