Connecting and construction method for joints between prefabricated diaphragm walls

Abstract

The invention discloses a connection and construction method for joints between prefabricated diaphragm walls, which comprises the following steps: arranging C-shaped steel keys and T-shaped steel keys between the diaphragm walls to ensure the splicing and connecting precision of the joints between the diaphragm walls; post-liquid-filling water-stop strip bags are arranged among the diaphragm wall panels, so that the waterproof quality of joints among the panels is ensured; inter-width grooves are formed between the underground diaphragm wall widths and then filled with self-compacting concrete, so that the strength and rigidity of inter-width seam connection ground are guaranteed; welded pre-embedded angle steel is arranged on the soil back side between the diaphragm walls, so that the strength, rigidity and waterproof quality of joint connection between the diaphragm walls are guaranteed; pre-buried grouting pipes are arranged between the diaphragm walls, so that the waterproof quality of joints between the diaphragm walls is guaranteed; uHPC is arranged on the soil back side of the underground diaphragm wall, and the durability of the embedded angle steel is guaranteed. The connection precision, strength, rigidity and waterproof quality of the joints between the assembly type underground diaphragm walls can be guaranteed, efficient and accurate connection of the assembly type underground diaphragm walls is guaranteed, the waterproof quality is reliable, and the connection strength and rigidity are safe.

Description

Technical Field

[0001] The present invention belongs to the field of underground structure engineering, and particularly relates to a connection and construction method for the joints between adjacent panels of precast diaphragm walls. Background Art

[0002] With the progress of technology and the development of the construction industry, the traditional construction methods are difficult to meet the requirements of high efficiency, environmental protection and sustainable development of modern buildings. Under such circumstances, precast construction, as a new construction method, has gradually received extensive attention. Among them, the precast permanent-temporary combined diaphragm wall can realize the combination of the retaining structure and the main structure, reduce the number of formworks, save the consumption of concrete, thereby reducing the project cost, and is more conducive to the popularization of precast construction methods.

[0003] Due to the high requirements for the assembly accuracy of precast structures, and the assembly of precast diaphragm walls must be completed underwater, which poses very high requirements for the assembly accuracy; the joint connection part between adjacent panels has always been a weak part in terms of force, and it is very easy to have problems such as water leakage at the joint connection part between adjacent panels. The above difficulties pose very high requirements for the connection accuracy, strength, stiffness and waterproof quality of the joints between adjacent panels of precast diaphragm walls. Summary of the Invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a connection and construction method for the joints between adjacent panels of precast diaphragm walls.

[0005] The technical solution of the present invention is: a connection and construction method for the joints between adjacent panels of precast diaphragm walls, including the following steps: A. C-shaped steel keys and T-shaped steel keys are arranged between adjacent panels of the diaphragm wall to ensure the assembly connection accuracy of the joints between adjacent panels; B. A post-filled liquid waterstop strip capsule is arranged between adjacent panels of the diaphragm wall to ensure the waterproof quality of the joints between adjacent panels; C. An inter-panel groove is arranged between adjacent panels of the diaphragm wall, and self-compacting concrete is filled later to ensure the connection strength and stiffness of the joints between adjacent panels; D. Welded embedded angle steels are arranged on the backfill side between adjacent panels of the diaphragm wall to ensure the connection strength, stiffness and waterproof quality of the joints between adjacent panels; E. Embedded grouting pipes are arranged between adjacent panels of the diaphragm wall to ensure the waterproof quality of the joints between adjacent panels; F. UHPC ultra-high performance concrete is arranged on the backfill side between adjacent panels of the diaphragm wall to ensure the durability of the embedded angle steel.

[0006] Furthermore, for step A, C-shaped steel keys and T-shaped steel keys are arranged between adjacent panels of the diaphragm wall to ensure the assembly connection accuracy of the joints between adjacent panels. The specific process is as follows: First, C-shaped steel keys are arranged in the nth precast diaphragm wall panel; Then, T-shaped steel keys are arranged in the (n + 1)th precast diaphragm wall panel; After that, insert the T-shaped steel keys protruding from the side wall into the C-shaped steel keys to ensure the lowering accuracy of the assembled diaphragm wall.

[0007] Furthermore, after the T-shaped steel keys are inserted into the C-shaped steel keys, inject quick-setting cement-based slurry into the steel flower pipes at the front ends of the T-shaped steel keys. The quick-setting cement-based slurry fills the joint between the panels to ensure the waterproof quality of the joint between the panels.

[0008] Furthermore, a post-filled liquid waterstop strip bladder is arranged between the panels of the diaphragm wall in step B to ensure the waterproof quality of the joint between the panels. The specific process is as follows: First, set two post-filled liquid waterstop strip bladders on the side wall of each panel of the diaphragm wall. Then, after the two assembled diaphragm walls are assembled, inject low-density polyurethane elastomer slurry into the post-filled liquid waterstop strip bladders. The post-filled liquid waterstop strip bladders squeeze each other to form a seal. Finally, the two post-filled liquid waterstop strip bladders form two waterproof barriers to ensure the waterproof quality of the joint between the panels.

[0009] Furthermore, an inter-panel groove is arranged between the panels of the diaphragm wall in step C, and then self-compacting concrete is filled to ensure the strength and stiffness of the connection of the joint between the panels. The specific process is as follows: First, set an inter-panel groove on the side wall of each panel of the diaphragm wall. Then, roughen the wall of the inter-panel groove. After that, assemble to form a hexagonal cavity. Finally, fill the cavity with self-compacting concrete to ensure the strength and stiffness of the connection of the joint between the panels.

[0010] Furthermore, welded embedded angle steels are arranged on the backfill side between the panels of the diaphragm wall in step D to ensure the strength, stiffness and waterproof quality of the connection of the joint between the panels. The specific process is as follows: First, set a welded embedded angle steel at each corner of the backfill side of each panel of the diaphragm wall. Then, after the nth assembled diaphragm wall and the (n + 1)th assembled diaphragm wall are assembled in place, weld the embedded angle steels between the panels. Finally, weld connecting steel bars on the outside of the embedded angle steels to ensure the strength, stiffness and waterproof quality of the connection of the joint between the panels.

[0011] Furthermore, embedded grouting pipes are arranged between the panels of the diaphragm wall in step E to ensure the waterproof quality of the joint between the panels. The specific process is as follows: First, set an embedded grouting pipe between the embedded angle steel and the post-filled liquid waterstop strip bladder. Then, after all the assembled diaphragm walls are assembled and the foundation pit excavation is completed, inject quick-setting cement-based slurry through the embedded grouting pipes to fill the joint to ensure the waterproof quality of the joint between the panels.

[0012] Furthermore, UHPC ultra-high performance concrete is provided on the backfill side between the diaphragm walls in step F to ensure the durability of the embedded angle steel. The specific process is as follows: After the embedded angle steel and connecting steel bars on the backfill side of the diaphragm wall are welded, UHPC ultra-high performance concrete is painted on the outside of the embedded angle steel to ensure the durability of the embedded angle steel.

[0013] The beneficial effects of the present invention are as follows: The present invention adopts the connection methods of C-shaped steel keys + T-shaped steel keys, water stop strip capsules + joint grouting for water stop, self-compacting concrete filling in the hexagonal cavity, and continuous welding of angle steel on the backfill side to ensure the connection accuracy, strength, stiffness and waterproof quality of the joints between the precast diaphragm wall panels, ensure the efficient and accurate connection of the precast diaphragm wall, reliable waterproof quality, and safe connection strength and stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic plan view of the connection of the joints between the diaphragm wall panels in the present invention; Figure 2 is a schematic vertical sectional view of the joints between the diaphragm wall panels in the present invention; Figure 3 is a schematic plan view of the C-shaped steel key in the present invention; Figure 4 is a schematic plan view of the T-shaped steel key in the present invention; Figure 5 is a schematic plan view of the post-filled liquid water stop strip capsule in the present invention; Figure 6 is a schematic plan view of the welded embedded angle steel in the present invention; Among them: 1 The nth precast diaphragm wall panel 2 The (n + 1)th precast diaphragm wall panel 3 Joint between panels 4 C-shaped steel key 5 T-shaped steel key 6 Steel flower pipe 7 Groove between panels 8 Post-filled liquid water stop strip capsule 9 Embedded angle steel 10 UHPC ultra-high performance concrete 11 Embedded grouting pipe 12 Ethylene propylene diene monomer rubber 13 Low-density polyurethane elastomer slurry 14 Quick-setting cement-based slurry 15 Connecting steel bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments: As Figures 1 to 6 shown, a connection method for joints between precast diaphragm wall panels includes the following steps: A. C-shaped steel keys 4 and T-shaped steel keys 5 are set between the diaphragm wall panels to ensure the assembly connection accuracy of the panel joints. B. Post-filled liquid waterstop strip capsules 8 are set between the diaphragm wall panels to ensure the waterproof quality of the panel joints. C. Inter-panel grooves 7 are set between the diaphragm wall panels and then filled with self-compacting concrete to ensure the strength and stiffness of the panel joint connection. D. Welded embedded angle steels 9 are set on the backfill side between the diaphragm wall panels to ensure the strength, stiffness and waterproof quality of the panel joint connection. E. Embedded grouting pipes 11 are set between the diaphragm wall panels to ensure the waterproof quality of the panel joints. F. Ultra-high performance concrete (UHPC) 10 is set on the backfill side between the diaphragm wall panels to ensure the durability of the embedded angle steel 9.

[0016] In step A, C-shaped steel keys 4 and T-shaped steel keys 5 are set between the diaphragm wall panels to ensure the assembly connection accuracy of the panel joints. The specific process is as follows: First, C-shaped steel keys 4 are set in the nth precast diaphragm wall 1. Then, T-shaped steel keys 5 are set in the (n + 1)th precast diaphragm wall 2. After that, the T-shaped steel keys 5 protruding from the side wall are inserted into the C-shaped steel keys 4 to ensure the lowering accuracy of the precast diaphragm wall.

[0017] After the T-shaped steel keys 5 are inserted into the C-shaped steel keys 4, quick-setting cement-based slurry 14 is injected from the steel flower pipes 6 at the front end of the T-shaped steel keys 5. The quick-setting cement-based slurry 14 fills the panel joint to ensure the waterproof quality of the panel joint.

[0018] In step B, post-filled liquid waterstop strip capsules 8 are set between the diaphragm wall panels to ensure the waterproof quality of the panel joints. The specific process is as follows: First, two post-filled liquid waterstop strip capsules 8 are set on the side wall of each diaphragm wall panel. Then, after the two precast diaphragm walls are assembled, low-density polyurethane elastomer slurry 13 is filled into the post-filled liquid waterstop strip capsules 8, and the post-filled liquid waterstop strip capsules 8 are pressed against each other to form a seal. Finally, the two post-filled liquid waterstop strip capsules 8 form two waterproof barriers to ensure the waterproof quality of the panel joints.

[0019] In step C, inter-panel grooves 7 are set between the diaphragm wall panels and then filled with self-compacting concrete to ensure the strength and stiffness of the panel joint connection. The specific process is as follows: First, one inter-panel groove 7 is set on the side wall of each diaphragm wall panel. Then, the groove walls of the inter-panel grooves 7 are roughened. After that, a hexagonal cavity is formed by assembly. Finally, the cavity is filled with self-compacting concrete to ensure the strength and stiffness of the panel joint connection.

[0020] In step D, embedded angle steels 9 are welded on the backfill side between the diaphragm wall panels to ensure the strength, stiffness and waterproof quality of the joint between the panels. The specific process is as follows: First, one embedded angle steel 9 is arranged at each corner of the backfill side of each diaphragm wall panel; Then, after the nth precast diaphragm wall 1 and the (n + 1)th precast diaphragm wall 2 are assembled in place, the embedded angle steels 9 between the panels are welded; Finally, connecting steel bars are welded outside the embedded angle steels 9 to ensure the strength, stiffness and waterproof quality of the joint between the panels.

[0021] In step E, embedded grouting pipes 11 are arranged between the diaphragm wall panels to ensure the waterproof quality of the joint between the panels. The specific process is as follows: First, one embedded grouting pipe 11 is arranged between the embedded angle steel 9 and the post - filled liquid - tight strip bladder 8; Then, after all the precast diaphragm walls are assembled and the foundation pit excavation is completed, a quick - setting cement - based grout 14 is injected through the embedded grouting pipes 11 to fill the joint, ensuring the waterproof quality of the joint between the panels.

[0022] In step F, ultra - high performance concrete (UHPC) 10 is arranged on the backfill side between the diaphragm wall panels to ensure the durability of the embedded angle steel 9. The specific process is as follows: After the embedded angle steel 9 and the connecting steel bars on the backfill side of the diaphragm wall are welded, UHPC 10 is painted outside the embedded angle steel 9 to ensure the durability of the embedded angle steel 9.

[0023] Specifically, the internal pressure of the strip bladder of the post - filled liquid - tight strip bladder 8 is not less than 0.4 MPa.

[0024] Specifically, the self - compacting concrete filled in the inter - panel groove 7 has a grade not lower than C30.

[0025] Specifically, HPB300 - grade connecting steel bars with a diameter of 8 mm and a vertical spacing of 150 mm are welded outside the embedded angle steel 9. Embodiment

[0026] Combined with the attached drawings of the specification, a connection method for the joint between precast diaphragm wall panels includes the following steps: A. C - shaped steel keys 4 and T - shaped steel keys 5 are arranged between the diaphragm wall panels to ensure the assembly connection accuracy of the joint between the panels, First, C - shaped steel keys 4 are arranged on the wall side of the nth diaphragm wall 1; Then, T - shaped steel keys 5 are arranged on the wall side of the (n + 1)th diaphragm wall 2; After that, the T-shaped steel key 5 of the (n + 1)-th diaphragm wall 2 is inserted into the C-shaped steel key 4 of the n-th diaphragm wall 1. At the same time, the unilateral gap between the C-shaped steel key 4 and the T-shaped steel key 5 is not greater than 5 mm to ensure the lowering accuracy of the assembled diaphragm wall. Finally, after the n-th diaphragm wall 1 and the (n + 1)-th diaphragm wall 2 are lowered in place, a quick-setting cement-based slurry 14 is injected from the steel pipe with holes 6 at the front end of the T-shaped steel key 5, and the grouting pressure is 0.8 - 1.0 MPa, so that the slurry fills the joint 3 between the panels to ensure the waterproof quality of the joint between the panels.

[0027] B. A post-filled liquid sealing strip bladder 8 is arranged between the panels of the diaphragm wall to ensure the waterproof quality of the joint between the panels. First, two post-filled liquid sealing strip bladders 8 are arranged on each side of each panel of the diaphragm wall. Then, the post-filled liquid sealing strip bladders 8 are arranged in a U-shape vertically on each side of each panel of the diaphragm wall. The post-filled liquid sealing strip bladders 8 are made of ethylene propylene diene monomer rubber 12, and the bottom of the post-filled liquid sealing strip bladders 8 is lower than the C-shaped steel key 4, the T-shaped steel key 5 and the groove 7 between the panels. After that, after the two assembled diaphragm walls are assembled, a low-density polyurethane elastomer slurry 14 is filled into the post-filled liquid sealing strip bladder 8 to ensure that the internal pressure of the bladder is not less than 0.4 MPa. Finally, the post-filled liquid sealing strip bladders 8 are squeezed against each other to form a seal, forming two waterproof barriers to ensure the waterproof quality of the joint between the panels.

[0028] C. A groove 7 is arranged between the panels of the diaphragm wall and then filled with self-compacting concrete to ensure the strength and stiffness of the connection of the joint between the panels. One groove 7 is arranged on each side of each panel of the diaphragm wall. The groove wall is roughened, and a hexagonal cavity is formed after assembly. The cavity is then filled with self-compacting concrete with a grade not lower than C30 to ensure the strength and stiffness of the connection of the joint between the panels.

[0029] D. Embedded angle steels 9 are welded on the backfill soil side between the panels of the diaphragm wall to ensure the strength, stiffness and waterproof quality of the connection of the joint between the panels. One embedded angle steel 9 is arranged at each corner of the backfill soil side of each assembled diaphragm wall. The thickness of the embedded angle steel 9 is not less than 8 mm. After the n-th diaphragm wall 1 and the (n + 1)-th diaphragm wall 2 are assembled in place, the angle steels 9 on both sides of the joint between the panels are continuously welded with a bevel. Then, HPB300 grade connecting bars 15 with a diameter of 8 mm and a vertical spacing of 150 mm are welded on the outside of the angle steels 9 to ensure the strength, stiffness and waterproof quality of the connection of the joint between the panels.

[0030] E. Embedded grouting pipes 11 are arranged between the panels of the diaphragm wall to ensure the waterproof quality of the joint between the panels. One embedded grouting pipe 11 is arranged between the embedded angle steel 9 and the post-filled liquid sealing strip bladder 8 of each assembled diaphragm wall. The joint is filled with a quick-setting cement-based slurry 14 through the embedded grouting pipe 11 to ensure the waterproof quality of the joint between the panels.

[0031] F. UHPC ultra-high performance concrete 10 is provided on the backfill side between the diaphragm wall panels to ensure the durability of the embedded angle steel 9. After the welding of the embedded angle steel 9 and the connecting steel bars 15 on the backfill side of the precast diaphragm wall is completed, UHPC ultra-high performance concrete 10 is painted on the outside to ensure the durability of the embedded angle steel 9.

[0032] As Figure 1 shown, two post-injected liquid waterstop strip capsules 8 are located on the upper and lower sides of the groove 7 between the panels. The C-shaped steel key 4 is arranged in the groove 7 between the panels of the nth precast diaphragm wall 1, and the T-shaped steel key 5 is arranged in the groove 7 between the panels of the (n + 1)th precast diaphragm wall 2.

[0033] One side of the embedded angle steel 9 in the nth precast diaphragm wall 1 is flush with the side wall of the nth precast diaphragm wall 1.

[0034] The lower ends of the nth precast diaphragm wall 1 and the (n + 1)th precast diaphragm wall 2 form a groove for accommodating the embedded angle steel 9.

[0035] As Figure 2 shown, the post-injected liquid waterstop strip capsule 8 is U-shaped.

[0036] As Figure 4 shown, a plurality of communication holes are formed in the pipe wall of the steel pipe with holes 6, and the communication holes are radial through holes. The T-shaped steel key 5 is fixed by welding.

[0037] As Figure 5 shown, the post-injected liquid waterstop strip capsule 8 is made of ethylene propylene diene monomer rubber 12, and the post-injected low-density polyurethane elastomer slurry 13 is filled in the post-injected liquid waterstop strip capsule 8. Three protruding strips are formed on one outer wall of the post-injected liquid waterstop strip capsule 8.

[0038] The construction process of the present invention is as follows: First step: Precast the reinforced concrete structure of the precast diaphragm wall. During precasting, the C-shaped steel key 4, the T-shaped steel key 5, the steel pipe with holes 6, and the embedded angle steel 9 on the backfill side are pre-embedded and fixed at the corresponding positions of the wall unit. After the precast diaphragm wall is completed, the post-injected liquid waterstop strip capsule 8 is pasted at the corresponding position of the precast diaphragm wall.

[0039] Second step: Construct the construction enclosure, level the site, construct the guide wall, and use the slurry-supported wall method to construct the trench of the precast diaphragm wall. Select a suitable trench construction machine according to the actual formation conditions.

[0040] Third step: Position and insert the nth precast diaphragm wall 1, and temporarily fix the nth precast diaphragm wall 1; align and insert the T-shaped steel key 5 of the (n + 1)th precast diaphragm wall 2 into the C-shaped steel key 4 of the nth precast diaphragm wall 1.

[0041] Step 4: Insert the subsequent diaphragm wall units along the direction of the diaphragm wall trench excavation in the same sequence as in Step 3. After inserting the (n + 3)-th prefabricated diaphragm wall, fill the post-grouting water-stop strip bladder 8 between the n-th diaphragm wall 1 and the (n + 1)-th diaphragm wall with low-density polyurethane elastomer slurry 13, and then pour self-compacting concrete into the hexagonal inter-sheet groove of the inter-sheet joint 3. After the self-compacting concrete reaches the design strength, inject rapid-setting cement-based slurry 14 through the perforated steel pipe 6, and the grouting pressure is 0.8 - 1.0 MPa.

[0042] Step 5: After all the prefabricated diaphragm walls are assembled in the above manner, carry out the foundation pit excavation. The embedded angle steel 9 at the backfill side corner of each prefabricated diaphragm wall is welded during excavation. The groove welding is carried out, and the welds are ensured to be continuous. After the welds are completed, weld HPB300 grade connecting steel bars 15 with a diameter of 8 mm and a vertical spacing of 150 mm outside the embedded angle steel 9 to ensure the strength, stiffness and waterproof quality of the inter-sheet joint connection.

[0043] Step 6: After the welding of the embedded angle steel 9 and the connecting steel bars 15 on the backfill side of the prefabricated diaphragm wall is completed, brush UHPC ultra-high performance concrete 10 on its outer side to ensure the durability of the embedded angle steel 9.

[0044] Step 7: Install a pre-embedded grouting pipe 11 between the embedded angle steel 9 and the post-filled liquid water-stop strip bladder 8 of each prefabricated diaphragm wall. After all the above steps are completed, inject rapid-setting cement-based slurry 14 through the pre-embedded grouting pipe 11 to fill the joint and ensure the waterproof quality of the inter-sheet joint.

[0045] The present invention adopts the connection methods of C-shaped steel keys + T-shaped steel keys, water-stop strip bladders + joint grouting for water stop, filling self-compacting concrete in the hexagonal cavity, and continuous welding of angle steel on the backfill side, to ensure the connection accuracy, strength, stiffness and waterproof quality of the inter-sheet joints of the prefabricated diaphragm wall, ensure the efficient and accurate connection of the prefabricated diaphragm wall, with reliable waterproof quality and safe connection strength and stiffness.

Claims

1. A method for connecting joints between assembled floor-connected wall panels, characterized in that: The following steps are involved: A. C-shaped steel keys (4) and T-shaped steel keys (5) are set between the ground-connected wall sections to ensure the assembly and connection accuracy between the sections; B. A post-liquid-filled water-stopping strip (8) is arranged between the sections of the ground-connected wall to ensure the waterproof quality of the joints between the sections; C. An inter-span groove (7) is provided between the spans of the ground-connected wall and then filled with self-compacting concrete to ensure the strength and rigidity of the joints between the spans; D. Pre-embedded angle steel (9) is welded on the soil side between the sections of the ground-connected wall to ensure the strength, rigidity and waterproof quality of the joints between the sections; E. Pre-buried grouting pipes (11) are arranged between the ground-connected wall sections to ensure the waterproof quality of the joints between the sections; F. UHPC ultra-high performance concrete (10) is provided on the back side of the ground-connected wall to ensure the durability of the embedded angle steel (9).

2. A method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step A: C-shaped steel keys (4) and T-shaped steel keys (5) are arranged between the widths of the ground-connected wall to ensure the assembly and connection accuracy of the seams between the widths. The specific process is as follows: First, a C-shaped steel key (4) is arranged in the nth assembled ground-connected wall (1); Then, a T-shaped steel key (5) is arranged in the n+1th assembled ground-connected wall (2); Then, the T-shaped steel key (5) protruding from the side wall is inserted into the C-shaped steel key (4) to ensure the lowering accuracy of the assembled ground-connected wall.

3. A method for connecting joints between assembled floor-connected wall panels according to claim 2, characterized in that: After the T-shaped steel key (5) is inserted into the C-shaped steel key (4), quick-setting cement-based slurry (14) is injected from the steel flower tube (6) at the front end of the T-shaped steel key (5), and the quick-setting cement-based slurry (14) fills the joints between the webs, thereby ensuring the waterproof quality of the joints between the webs.

4. A method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step B: a rear-filled water-stopping strip bag (8) is arranged between the sections of the ground-connected wall to ensure the waterproof quality of the joints between the sections. The specific process is as follows: First, two post-liquid-filled water-stopping strip bags (8) are arranged on each side of the ground-connected wall; Then, after the two assembled ground-connected walls are assembled, the low-density polyurethane elastomer slurry (13) is filled into the rear-filled liquid-stopping strip bag (8), and the rear-filled liquid-stopping strip bags (8) are squeezed against each other to form a seal; Finally, the two post-liquid-filled water-stopping strip bags (8) form two waterproof barriers to ensure the waterproof quality of the seams between the webs.

5. The method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step C: An inter-span groove (7) is provided between the panels of the ground-connected wall, and then filled with self-compacting concrete to ensure the strength and rigidity of the joints between the panels. The specific process is as follows: First, an inter-wall groove (7) is provided on each side of each floor-connected wall; Then, the groove wall of the groove (7) between the webs is roughened; Then, assemble to form a hexagonal cavity; Finally, the cavity is filled with self-compacting concrete to ensure the strength and rigidity of the joints between the webs.

6. A method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step D: welded embedded angle steel (9) is arranged on the soil side between the sections of the ground-connected wall to ensure the strength, rigidity and waterproof quality of the joint connection between the sections. The specific process is as follows: First, a pre-buried angle steel (9) is provided at each corner of the back soil side of each ground-connected wall; Then, after the nth assembled ground-connected wall (1) and the n+1th assembled ground-connected wall (2) are assembled in place, the embedded angle steels (9) between the walls are welded; Finally, the connecting steel bars are welded on the outside of the embedded angle steel (9) to ensure the strength, rigidity and waterproof quality of the web joint connection.

7. A method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step E: pre-buried grouting pipes (11) are arranged between the sections of the ground-connected wall to ensure the waterproof quality of the joints between the sections. The specific process is as follows: First, a pre-buried grouting pipe (11) is provided between the pre-buried angle steel (9) and the post-liquid-filled water-stopping strip bag (8); Then, after all the assembled ground-anchored walls are assembled and the foundation pit is excavated, quick-setting cement-based slurry (14) is injected through the pre-buried grouting pipe (11) to fill the joints, thereby ensuring the waterproof quality of the joints between the panels.

8. The method for connecting joints between assembled floor-connected wall panels according to claim 1, characterized in that: Step F: UHPC ultra-high performance concrete (10) is arranged on the back side of the ground-connected wall to ensure the durability of the embedded angle steel (9). The specific process is as follows: After the welding of the embedded angle steel (9) and the connecting steel bars on the back soil side of the ground-connected wall is completed, UHPC ultra-high performance concrete (10) is brushed on the outer side of the embedded angle steel (9) to ensure the durability of the embedded angle steel (9).

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