Water-rich sand layer joint combined anti-seepage underground diaphragm wall and construction method thereof

Abstract

The invention relates to a water-rich sand layer joint combined anti-seepage underground diaphragm wall and a construction method thereof. The construction method comprises the construction steps of an anti-streaming wall brushing device technology, a joint sand bag chute backfilling and control technology, a leaked water treatment technology, a bag anti-streaming technology and a guide plate control casing milling joint treatment technology. The invention belongs to the field of foundation and foundation engineering construction, not only can the wall brushing quality, the sand bag backfilling efficiency and precision and the leaked water treatment effect be improved, but also concrete streaming can be prevented, meanwhile, pollution to the surrounding environment is reduced, manpower and cost are saved, the construction efficiency is high, and good technical and economic benefits can be obtained when the device is applied to actual engineering.

Description

Technical Field

[0001] The invention belongs to the field of underground engineering and is suitable for the construction of underground continuous walls in water-rich sand layers with high anti-seepage requirements. Background Art

[0002] With the rapid development of urban underground engineering construction, there are more and more underground deep foundation pit projects, the depth of foundation pits is getting deeper and deeper, and the geology and hydrogeology are uneven, complex and changeable, which leads to quality defects in the construction of foundation pit engineering retaining structures, resulting in water leakage in the foundation pit. Especially in the construction of underground continuous wall retaining structures in water-rich sand layers and the excavation of foundation pits, once water leakage or water and sand gushing occurs, if it is not handled in time or improperly, it is easy to cause the foundation pit to become unstable, resulting in serious deformation of the foundation pit itself, surrounding roads, municipal pipelines and surrounding buildings (structures), causing immeasurable losses. Therefore, if you are not careful during the construction of the ground-connected wall joints, it may harm the overall stiffness and anti-seepage performance of the underground continuous wall.

[0003] In view of this, in view of the shortcomings in the previous construction of water-rich sand layer ground-connected walls, a new construction method of water-rich sand layer joint combined anti-seepage underground continuous wall is urgently needed to improve construction efficiency and anti-seepage effect, improve construction quality, and ensure safe and reliable construction process. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a water-rich sand layer joint combined anti-seepage underground continuous wall which can effectively improve the wall brushing quality, sand bag backfilling efficiency and accuracy, and leakage water treatment effect, and can also prevent concrete bypass, while reducing pollution to the surrounding environment, saving manpower and costs, and has the advantages of high construction efficiency, convenient construction, and simple operation.

[0005] To achieve the above technology, the present invention adopts the following technical solutions:

[0006] The construction method of the water-rich sand layer joint combined anti-seepage underground continuous wall comprises the following steps:

[0007] Step 1: Construction preparation:

[0008] Be familiar with the construction process, brief on-site technicians, and prepare the required materials and equipment;

[0009] Step 2: Ground-connected wall trenching construction:

[0010] After measuring and setting out, the trenching construction is carried out, and then the wall brushing construction is carried out by using the anti-circumvention wall brushing device, which is fixed on the trenching machine for wall brushing construction;

[0011] Step 3: Ground-connected wall construction:

[0012] Use I-beam joints. After the continuous wall reinforcement construction is completed, sandbags are used to backfill the gap between the I-beam joint and the end groove wall. The sandbag backfill construction adopts the sandbag chute backfill and control system at the joint;

[0013] The sleeve milling joint is used. Before the first phase of the trough section is poured with concrete, guide plates need to be installed on both sides of the trough section to control the sleeve milling joint processing system, so as to facilitate the guiding and positioning of the milling wheel box in the initial stage of the second phase of the trough section, and ensure that the cutting thickness and trough verticality of the poured concrete of the first phase of the trough section meet the requirements;

[0014] Step 4: Construction of steel bag anti-bypass structure:

[0015] The water injection bag is arranged on one side of the I-beam, the water injection port and the bag hanging piece are arranged on the water injection bag, the sealing piece is arranged at the water injection port, the bracket fixing base is arranged on the outside of the groove wall, the water injection pipe is arranged in the water injection bag through the water injection port, the vertical frame is arranged on the bracket fixing base, the horizontal frame connects the vertical frames on both sides, the electric hoist is fixed on the horizontal frame through the electric hoist fixing piece, water is injected into the water injection bag through the water injection pipe and sealed with the sealing piece, and after the concrete pouring construction on one side is completed, it is lifted away by the electric hoist;

[0016] Step 5: Construction of leaking water treatment system:

[0017] Apply quick-drying cement to the leaking location. Insert one end of the injection pipe into the leaking location and connect the other end to a high-pressure pump. The high-pressure pump is located in the foundation pit, the bucket is located on the high-pressure pump, and polyurethane is located in the bucket. Polyurethane is injected through the high-pressure pump, and then the injection pipe is cut off to smooth the quick-drying cement.

[0018] Step 6: Construction completed:

[0019] After inspection and acceptance, the relevant equipment will be removed from the site.

[0020] Furthermore, the anti-bypass wall brush device includes a front end plate, a connecting plate, a rear end plate, and bucket teeth. The front end plate and the rear end plate are fixed by the connecting plate, and the bucket teeth are arranged on the front end plate.

[0021] Furthermore, the sand bag chute backfill and control system at the joint includes I-beams, continuous wall steel bars, steel bases, supporting steel, chute bottom plates, chute side plates, sand bags, steel support brackets, steel mesh fixing frames, steel mesh, and horizontal steel. The I-beams are arranged at the ground-connected wall joints, the continuous wall steel bars are arranged in the casting trough section, the steel bases are arranged at the trough tops on both sides of the ground-connected wall slot holes, the supporting steel is arranged on the steel bases, the horizontal steel connects the supporting steels on both sides, the upper end of the chute bottom plate is arranged on the horizontal steel, and the lower end is arranged at the ground-connected wall joint, the chute side plates are arranged on the chute bottom plate, the sand bags slide from the chute bottom plate to the joint, the steel support brackets are arranged at the trough tops on both sides of the ground-connected wall slot holes, the top of the steel mesh fixing frame is fixed on the steel support brackets, and the bottom end is arranged at the I-beam joint, the steel mesh is arranged in the steel mesh fixing frame, and the sand bags slide from the chute bottom plate to the gap.

[0022] Furthermore, the guide plate controlled sleeve milling joint processing system includes a U-shaped groove, a guide plate, and a U-shaped groove bottom plate. The U-shaped groove is arranged in a first-phase groove section and is fixed to the groove wall by U-shaped groove fixing nails. The U-shaped groove bottom plate is arranged at the bottom of the U-shaped groove, and the guide plate is arranged in the U-shaped grooves on both sides.

[0023] The water-rich sand layer joint combined anti-seepage underground continuous wall is constructed by the above-mentioned water-rich sand layer joint combined anti-seepage underground continuous wall construction method.

[0024] The present invention has the following characteristics and beneficial effects:

[0025] 1) The anti-circumvention wall brush device is used for wall brushing construction, which reduces the difficulty of removing stubborn attachments, improves the wall brushing quality, and speeds up the wall brushing time.

[0026] 2) The sandbag chute backfill and control system at the joint is used to avoid sandbags falling into the underground continuous wall steel cage due to operational errors. At the same time, the sandbags can be accurately backfilled to the position of the I-beam and the end groove wall, improving the construction accuracy.

[0027] 3) The leaking water treatment system is used to treat the leaking water, which is simple to operate and has good construction effect, effectively ensuring the safety of the foundation pit.

[0028] 4) The bag anti-bypass structure is used for construction, which has good filling and sealing effects, solves the problem of concrete bypass, and provides temporary support and stability for weak parts, ensuring the safety of the construction work surface, facilitating lifting and disassembly, and increasing the service life of the ground-connected wall. At the same time, it will not generate waste and reduce the impact on the environment.

[0029] 5) The construction of the sleeve milling joint processing system is controlled by the guide plate, which facilitates the guiding and positioning of the second-phase slot section, improves the construction efficiency, and ensures the thickness and verticality of the first-phase slot section. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 12. It is a top view of the structure of the anti-circumvention wall brush device according to an embodiment of the present invention;

[0031] Figure 2 2. It is a front view of the structure of the anti-circumvention wall brush device according to an embodiment of the present invention;

[0032] Figure 3 It is a front view of the backfilling and control system structure of the sand bag chute at the joint of the embodiment of the present invention;

[0033] Figure 4 It is a left view of the backfilling and control system structure of the sand bag chute at the joint of the embodiment of the present invention;

[0034] Figure 5 It is a right view of the backfilling and control system structure of the sand bag chute at the joint of the embodiment of the present invention;

[0035] Figure 6 is a schematic diagram of the system structure of the leaking water treatment system according to an embodiment of the present invention;

[0036] Figure 7 is a top view of the bag anti-circumvention structure according to an embodiment of the present invention;

[0037] Figure 8 is a side view of the bag anti-circumvention structure according to an embodiment of the present invention;

[0038] Fig. 9 Schematic diagram of the system structure of the guide plate controlled sleeve milling joint processing system according to an embodiment of the present invention;

[0039] Fig.10 yes Fig. 9 Middle AA section view.

[0040] In the figure, 1, front plate; 2, connecting plate; 3, rear plate; 4, bucket teeth; 5, I-beam; 6, casting trough section; 7, continuous wall reinforcement; 8, trough top; 9, steel base; 10, supporting steel; 11, chute bottom plate; 12, chute side plate; 13, sandbag; 14, steel support; 15, steel mesh fixing frame; 16, steel mesh; 17, horizontal steel; 18, ground-connected wall; 19, foundation pit; 20, water leakage location; 21, brushing quick-drying cement; 2 2. Liquid injection pipe; 23. High-pressure pump; 24. Bucket; 25. Polyurethane; 26. Tank wall; 27. Water injection bag; 28. Water injection port; 29. ​​Seal; 30. Bag hanger; 31. Bracket fixing base; 32. Water injection pipe; 33. Vertical frame; 34. Horizontal frame; 35. Electric hoist; 36. Electric hoist fixing part; 37. Phase I tank section; 38. Phase II tank section; 39. U-shaped tank; 40. Guide plate; 41. U-shaped tank fixing nail; 42. U-shaped tank bottom plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0042] Those skilled in the art should understand that, in the disclosure of the present application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present application.

[0043] Example 1

[0044] Figure 1 This is a top view of the structure of the anti-circumvention wall brush device. Figure 2 This is the front view of the structure of the anti-circumvention wall brush device. Figure 3 This is the front view of the sand bag chute backfill and control system structure at the joint. Figure 4 This is the left view of the sand bag chute backfill and control system structure at the joint. Figure 5 The right view of the sand bag chute backfill and control system structure at the joint. Figure 6 This is a schematic diagram of the leak water treatment system structure. Figure 7 This is a top view of the bag anti-circumvention structure. Figure 8 This is the side view of the bag anti-circumvention structure. Fig. 9 This is a schematic diagram of the system structure of the guide plate controlled sleeve milling joint processing. Fig.10 yes Fig. 9 Middle AA section view.

[0045] like Figures 1 to 10 As shown, the construction structure of the water-rich sand layer joint combined anti-seepage underground continuous wall includes an anti-circumvention wall brush device, a sand bag chute backfill and control system at the joint, a leakage water treatment system, a bag anti-circumvention structure, and a guide plate control sleeve milling joint treatment system;

[0046] The anti-bypass wall brush device comprises a front end plate 1, a connecting plate 2, a rear end plate 3, and bucket teeth 4. The front end plate 1 and the rear end plate 3 are fixed by the connecting plate 2, and the bucket teeth 4 are arranged on the front end plate 1.

[0047] As an improved specific implementation method, it also includes a sand bag chute backfilling and control system at the joint, which includes an I-beam 5, a continuous wall reinforcement 7, a steel base 9, a supporting steel 10, a chute bottom plate 11, a chute side plate 12, a sand bag 13, a reinforcement bracket 14, a reinforcement mesh fixing frame 15, a reinforcement mesh 16, and a horizontal steel 17. The I-beam 5 is arranged at the ground-connected wall joint, the continuous wall reinforcement 7 is arranged in the casting trough section 6, and the steel base 9 is arranged at the trough top on both sides of the ground-connected wall 18 slot hole. 8. The supporting steel 10 is arranged on the steel base 9. The horizontal steel 17 connects the supporting steels 10 on both sides. The upper end of the chute bottom plate 11 is arranged on the horizontal steel 17, and the lower end is arranged at the joint. The chute side plate 12 is arranged on the chute bottom plate 11. The sandbag 13 slides from the chute bottom plate 11 to the joint. The steel bar bracket 14 is arranged on the trough top 8 on both sides of the slot hole of the ground connecting wall 18. The top of the steel mesh fixing frame 15 is fixed on the steel bar bracket 14, and the bottom end is arranged at the joint of the I-beam 5. The steel mesh 16 is arranged in the steel mesh fixing frame 15.

[0048] As an improved specific implementation method, it also includes a leakage water treatment system, which includes a quick-drying cement coating 21, an injection pipe 22, a high-pressure pump 23, a bucket 24, and polyurethane 25. The quick-drying cement coating 21 is arranged on the surface of the leakage water position 20 of the ground-connected wall 18, one end of the injection pipe 22 is inserted into the leakage water position 20, and the other end is connected to the high-pressure pump 23, the high-pressure pump 23 is arranged in the foundation pit 19, the bucket 24 is arranged on the high-pressure pump 23, and the polyurethane 25 is arranged in the bucket 24.

[0049] As an improved specific implementation method, it also includes a bag anti-circumvention structure. The steel bag anti-circumvention structure includes a water injection bag 27, a water injection port 28, a seal 29, a bag hanger 30, a bracket fixed base 31, a water injection pipe 32, a vertical frame 33, a horizontal frame 34, an electric hoist 35, and an electric hoist fixing member 36. The water injection bag 27 is arranged on one side of the I-beam 5, the water injection port 28 and the bag hanger 30 are arranged on the water injection bag 27, the seal 29 is arranged at the water injection port 28, the bracket fixed base 31 is arranged on the outside of the groove wall 26, the water injection pipe 32 is arranged in the water injection bag 27 through the water injection port 28, the vertical frame is arranged on the bracket fixed base 31, the horizontal frame 34 connects the vertical frames 33 on both sides, and the electric hoist 35 is fixed to the horizontal frame 34 through the electric hoist fixing member 36.

[0050] As an improved specific implementation method, it also includes a guide plate controlled sleeve milling joint processing system, which includes a U-shaped groove 39, a guide plate 40, a U-shaped groove fixing nail 41, and a U-shaped groove bottom plate 42. The U-shaped groove 39 is arranged in the first-phase groove section 37 and is fixed to the groove wall 26 by the U-shaped groove fixing nail 41. The U-shaped groove bottom plate 42 is arranged at the bottom of the U-shaped groove 39, and the guide plate 40 is arranged in the U-shaped groove 39 on both sides.

[0051] Example 2

[0052] The invention discloses a water-rich sand layer joint combined anti-seepage underground continuous wall and a construction method thereof, comprising the following steps:

[0053] Step 1: Construction preparation: familiarize yourself with the construction process, brief on-site technical personnel, and prepare the necessary materials and equipment.

[0054] Step 2: trenching construction of ground-connected wall: after measurement and layout, trenching machine is used for trenching construction, and then wall brushing construction is carried out through anti-bypass flow brushing device. The front end plate 1 and the rear end plate 3 are fixed by the connecting plate 2, and the bucket tooth 4 is arranged on the front end plate 1. After assembly, it is fixed on the trenching machine for wall brushing construction.

[0055] Step three, ground-connected wall construction: use I-beam 5 joints, and after the construction of continuous wall reinforcement 7 is completed, use sandbags to backfill the gap between the I-beam joint and the end slot wall. The sandbag backfill construction adopts the sandbag chute backfill and control system at the joint. The steel base 9 is arranged on the slot top 8 on both sides of the slot hole of the ground-connected wall 18, and the supporting steel 10 is arranged on the steel base 9. The horizontal steel 17 connects the supporting steel 10 on both sides. The upper end of the chute bottom plate 11 is arranged on the horizontal steel 17, and the bottom end is arranged at the joint. The chute side plate 12 is arranged on the chute bottom plate 11, and the steel bar support 14 is arranged on the slot top 8 on both sides of the slot hole of the ground-connected wall 18. The top of the steel mesh fixing frame 15 is fixed on the steel bar support 14, and the bottom end is arranged at the joint of the I-beam 5. The steel mesh 16 is arranged in the steel mesh fixing frame 15, and the sandbag 13 slides from the chute bottom plate 11 to the gap.

[0056] By adopting a sleeve milling joint, before pouring concrete for the first-phase slot segment 37, guide plates need to be installed on both sides of the slot segment. The guide plates are arranged in the first-phase slot segment 37 through a U-shaped slot 39 and fixed to the slot wall 26 through a U-shaped slot fixing nail 41. The U-shaped slot bottom plate 42 is arranged at the bottom of the U-shaped slot 39, and the guide plates 40 are arranged in the U-shaped slots 39 on both sides, which is convenient for guiding and positioning the milling wheel box in the initial stage of slot formation of the second-phase slot segment 38, ensuring that the cutting thickness and slot verticality of the poured concrete of the first-phase slot segment 37 meet the requirements.

[0057] Step 4, construction of anti-bypass flow bag at the joint of I-beam: a water injection bag 27 is arranged on one side of the I-beam 5, a water injection port 28 and a bag hanger 30 are arranged on the water injection bag 27, a seal 29 is arranged at the water injection port 28, a bracket fixing base 31 is arranged on the outside of the groove wall 26, a water injection pipe 32 is arranged in the water injection bag 27 through the water injection port 28, a vertical frame is arranged on the bracket fixing base 31, a horizontal frame 34 connects the vertical frames 33 on both sides, an electric hoist 35 is fixed to the horizontal frame 34 through an electric hoist fixing part 36, water is injected into the bag through the water injection pipe and sealed with a seal 29, and after the concrete pouring construction on one side is completed, it is lifted away with the electric hoist 35.

[0058] Step five, leaking water treatment construction: brush quick-drying cement 21 at the leaking water position 20, insert one end of the injection pipe 22 into the leaking water position 20, and connect the other end to the high-pressure pump 23. The high-pressure pump 23 is arranged in the foundation pit 19, and the bucket 24 is arranged on the high-pressure pump 23. The polyurethane 25 is arranged in the bucket 24. The polyurethane 25 is injected through the high-pressure pump 23, and then the injection pipe 22 is cut off to smooth the quick-drying cement.

[0059] Step six, construction completion: after inspection and acceptance, the relevant equipment will be removed from the site.

[0060] The parts not described in detail in this application are prior art, so this application does not describe them in detail.

[0061] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0062] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of this application; interpreting them as any additional restrictions is contrary to the spirit of this application.

[0063] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of this application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A construction method for a water-rich sand layer joint combined anti-seepage underground continuous wall, characterized in that: The following steps are involved: Step 1: Construction preparation: Be familiar with the construction process, brief on-site technicians, and prepare the required materials and equipment; Step 2: Ground-connected wall trenching construction: After measuring and setting out, the trenching construction is carried out, and then the wall brushing construction is carried out by using the anti-circumvention wall brushing device, which is fixed on the trenching machine for wall brushing construction; Step 3: Ground-connected wall construction: An I-beam (5) joint is used, and after the construction of the continuous wall reinforcement (7) is completed, the gap between the I-beam (5) joint and the end groove wall is backfilled with sandbags. The sandbag backfilling construction adopts a sandbag chute backfilling and control system at the joint; A sleeve milling joint is used. Before the first-stage slot section (37) is poured with concrete, guide plates need to be installed on both sides of the slot section to control the sleeve milling joint processing system, so as to facilitate the guiding and positioning of the milling wheel box in the initial slotting of the second-stage slot section (38), and ensure that the cutting thickness and slotting verticality of the poured concrete of the first-stage slot section (37) meet the requirements; Step 4: Construction of steel bag anti-circumvention structure: A water injection bag (27) is arranged on one side of the I-beam (5), a water injection port (28) and a bag hanging member (30) are arranged on the water injection bag (27), a sealing member (29) is arranged at the water injection port (28), a bracket fixing base (31) is arranged on the outside of the groove wall (26), a water injection pipe (32) is arranged in the water injection bag (27) through the water injection port (28), a vertical frame is arranged on the bracket fixing base (31), a horizontal frame (34) connects the vertical frames (33) on both sides, an electric hoist (35) is fixed on the horizontal frame (34) through an electric hoist fixing member (36), water is injected into the water injection bag (27) through the water injection pipe (32) and sealed with the sealing member (29), and after the concrete pouring construction on one side is completed, the water injection bag (27) is lifted away by the electric hoist (35); Step 5: Construction of leaking water treatment system: Quick-drying cement (21) is applied to the leaking water position (20). One end of the injection pipe (22) is inserted into the leaking water position (20), and the other end is connected to a high-pressure pump (23). The high-pressure pump (23) is arranged in the foundation pit (19), the bucket (24) is arranged on the high-pressure pump (23), and polyurethane (25) is arranged in the bucket (24). The polyurethane (25) is injected through the high-pressure pump (23), and then the injection pipe (22) is cut off to smooth the quick-drying cement. Step 6: Construction completed: After inspection and acceptance, the relevant equipment will be removed from the site.

2. The construction method of the water-rich sand layer joint combined anti-seepage underground continuous wall according to claim 1, characterized in that: The anti-circumvention wall brush device comprises a front end plate (1), a connecting plate (2), a rear end plate (3), and bucket teeth (4); the front end plate (1) and the rear end plate (3) are fixed via the connecting plate (2), and the bucket teeth (4) are arranged on the front end plate (1).

3. The construction method of the water-rich sand layer joint combined anti-seepage underground continuous wall according to claim 1, characterized in that: The sand bag chute backfill and control system at the joint comprises an I-beam (5), a continuous wall reinforcement (7), a steel base (9), a supporting steel (10), a chute bottom plate (11), a chute side plate (12), a sand bag (13), a reinforcement bracket (14), a reinforcement mesh fixing frame (15), a reinforcement mesh (16), and a horizontal steel (17). The I-beam (5) is arranged at the joint of the ground-connected wall (18), the continuous wall reinforcement (7) is arranged in the casting trough section (6), the steel base (9) is arranged at the trough top (8) on both sides of the trough hole of the ground-connected wall (18), the supporting steel (10) is arranged on the steel base (9), and the horizontal steel (17) is connected to the ground-connected wall (18). The upper end of the chute bottom plate (11) is arranged on the horizontal shaped steel (17), and the lower end is arranged at the joint of the ground connecting wall (18). The chute side plate (12) is arranged on the chute bottom plate (11). The sandbag (13) slides down from the chute bottom plate (11) to the joint. The steel bar bracket (14) is arranged on the trough top (8) on both sides of the slot hole of the ground connecting wall (18). The top end of the steel mesh fixing frame (15) is fixed on the steel bar bracket (14), and the lower end is arranged at the joint of the I-beam (5). The steel mesh (16) is arranged in the steel mesh fixing frame (15). The sandbag (13) slides down from the chute bottom plate (11) to the gap.

4. The construction method of the water-rich sand layer joint combined anti-seepage underground continuous wall according to claim 1, characterized in that: The guide plate controlled sleeve milling joint processing system comprises a U-shaped groove (39), a guide plate (40), and a U-shaped groove bottom plate (42); the U-shaped groove (39) is arranged in a first-stage groove section (37) and fixed on a groove wall (26) by means of a U-shaped groove fixing nail (41); the U-shaped groove bottom plate (42) is arranged at the bottom of the U-shaped groove (39); and the guide plate (40) is arranged in the U-shaped grooves (39) on both sides.

5. Water-rich sand layer joint combined anti-seepage underground continuous wall, characterized in that: The wall is obtained by the construction method of the water-rich sand layer joint combined anti-seepage underground continuous wall according to any one of claims 1 to 4.

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