Deep foundation pit water stop excavation device

Abstract

The invention relates to a deep foundation pit water stop excavation device, and belongs to the technical field of foundation pit construction. Comprising a foundation pit body and a supporting assembly arranged on the side wall of the foundation pit body, the supporting assembly comprises a supporting plate attached to the side wall of the foundation pit body and an enclosure plate arranged on the side, away from the side wall of the foundation pit body, of the supporting plate, and a plurality of evenly-distributed connecting pieces are arranged on the side, close to the side wall of the foundation pit body, of the enclosure plate; a seepage pipe penetrating through the supporting plate and extending to the side wall of the foundation pit body is fixedly connected to the connecting piece, the part, located on the side wall of the foundation pit body, of the seepage pipe extends towards the ground, and a plurality of seepage holes are formed in the seepage pipe. By means of the foundation pit, the problems that in the prior art, in the construction process of a foundation pit body, the shear strength of a soil body is reduced, and collapse is likely to happen are solved.

Description

Technical Field

[0001] The invention relates to a deep foundation pit water-stopping excavation device, belonging to the technical field of foundation pit construction. Background Art

[0002] During the excavation of foundation pits, the shear strength of the soil is generally low, and the tensile strength is almost negligible, but the soil has a certain structural integrity. When the foundation pit is excavated, the soil has a critical height to make the slope upright. When this depth is exceeded or under the influence of ground overload and other factors, the slope will suddenly fail as a whole. In order to prevent the side sliding of the foundation pit slope, a retaining structure is currently set up on the outside of the foundation pit before the excavation of the foundation pit. However, in the case of precipitation, a large amount of rainwater will infiltrate the land around the foundation pit, causing the soil on the side walls of the foundation pit to become softer, and the stability of the foundation pit support structure is reduced, which is prone to the collapse of the side walls of the foundation pit.

[0003] In response to the above technical problems, after searching, a Chinese patent with announcement number CN108978692B discloses a deep foundation pit drainage system, the technical key points of which are: it includes a foundation pit body, drainage wells are arranged at the four corners of the foundation pit body, a water pump is arranged in the drainage well, a support plate is arranged in the foundation pit body and abuts against the side walls of the foundation pit body, a plurality of drainage pipes are arranged on the support plate, the drainage pipes pass through the support plate and are fixedly connected to the support plate, the end of the drainage pipe in the side wall of the foundation pit body is set as a closed end, the end of the drainage pipe away from the closed end is an open end, a plurality of drainage holes are opened on the drainage pipe along the length direction of the drainage pipe, a plate body parallel to the support plate is also arranged in the foundation pit body, the plate body and the support plate are arranged at intervals, a fixed plate is arranged on the plate body and at a position where the plate body contacts the bottom wall of the foundation pit body, the fixed plate is perpendicular to the plate body, the support plate is connected to the fixed plate, and both ends of the fixed plate are connected to the drainage well.

[0004] In the above scheme, drainage pipes and sponge strips are set up to drain the seepage water and prevent the soil on the side wall of the foundation pit from becoming loose. However, due to construction reasons, especially earthwork excavation, the surrounding soil will be disturbed, resulting in soil structure damage and changes in stress distribution. Mechanical excavation and soil deflection during construction may also reduce the soil shear strength, cause consolidation, compaction and deformation of the soil, and eventually cause longitudinal cracks in the soil, which is prone to collapse.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a deep foundation pit water-stopping excavation device, which solves the problem in the prior art that the shear strength of the soil of the foundation pit body is reduced during the construction process and is prone to collapse.

[0007] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions: A deep foundation pit water-stopping excavation device comprises a foundation pit body and a support assembly arranged on the side wall of the foundation pit body, characterized in that: the support assembly is evenly provided with a plurality of seepage pipes penetrating into the inside of the side wall of the foundation pit body, and the seepage pipes are provided with a plurality of seepage holes; A tension stop is provided on the top surface of the side wall of the foundation pit body, and the tension stop includes a fixed plate embedded in the ground on one side of the top of the foundation pit body, and a plurality of Y-shaped connecting sleeves connected to the fixed plate. The Y-shaped connecting sleeve includes a fixed rod connected to the fixed plate, and a V-shaped pipe sleeve connected to the bottom of the fixed rod. The bottom end of the fixed rod is hingedly connected to the top end of the V-shaped pipe sleeve, and the end of the seepage pipe close to the ground extends upward and is fixedly connected to the V-shaped pipe sleeve.

[0008] The present invention is further configured as follows: the seepage pipes are divided into several rows in the depth direction of the foundation pit body, the stop members are provided with several groups in the direction away from the foundation pit body and correspond one-to-one to each row of the seepage pipes, the top row of the seepage pipes is correspondingly connected to the stop members closest to the foundation pit body, the fixed plate extends along the side length direction of the foundation pit body, a plurality of the Y-shaped connecting sleeves are evenly distributed along the length direction of the fixed plate, and two adjacent seepage pipes in the same row are connected to the same V-shaped pipe sleeve.

[0009] The present invention is further configured as follows: the support assembly comprises a support plate attached to the side wall of the foundation pit body, a retaining plate arranged on the side of the support plate away from the side wall of the foundation pit body, a side of the retaining plate close to the side wall of the foundation pit body is provided with a plurality of evenly distributed connecting pieces, the seepage pipes pass through the support plate and are fixedly connected to the connecting pieces one by one; The bottom of the support plate is fixedly connected with a horizontal plate extending toward the enclosure plate, the top surface of the horizontal plate is provided with a positioning groove, and the bottom of the enclosure plate is slidably inserted into the positioning groove; Drainage ditches are provided around the bottom surface of the foundation pit body, and the drainage ditches are located between the support plate and the retaining plate. A water outlet hole is provided at the portion of the seepage pipe located between the support plate and the retaining plate. A plurality of drainage holes are provided at the portion of the cross plate corresponding to the drainage ditch, and the portion between the support plate and the retaining plate is filled with sand and gravel particles.

[0010] The present invention is further configured as follows: a connecting hole is opened on the fixing plate corresponding to the fixing rod, the fixing rod is slidably inserted into the connecting hole, the top end of the fixing rod passes through the fixing plate and extends to above the fixing plate and is threadedly connected with an adjusting bolt.

[0011] The present invention is further configured as follows: the enclosure plate includes a plurality of plate units and a plurality of brackets for connecting adjacent plate units, the plurality of plate units are divided into a plurality of rows in the depth direction of the foundation pit body, and the plate units of two adjacent rows are staggered in the arrangement direction, the bracket includes a cross bar and a longitudinal bar fixedly connected to the upper middle portion of the cross bar, the longitudinal bar is perpendicular to the cross bar, and the cross bar and the longitudinal bar have I-shaped cross sections, the length of the longitudinal bar is equal to the height of the plate unit, the length of the cross bar is equal to the width of the plate unit, the bottoms of two adjacent plate units are respectively plugged into the upper portion of the cross bar and are respectively located on both sides of the longitudinal bar, the tops of the adjacent plate units located in the lower layer are plugged into the lower portion of the cross bar, the tops of the uppermost plate units are buckled and fixedly connected with C-shaped bars, and the connecting members are connected one-to-one between each three adjacent groups of brackets.

[0012] The present invention is further configured as follows: the connecting member includes a triangular plate and a reinforcing rib fixedly connected to one side of the triangular plate, the triangular plate cover is arranged at the connection between three adjacent groups of brackets, and the three corners of the triangular plate respectively correspond to the three adjacent plate body units and are locked with the plate body units by bolts.

[0013] The present invention is further configured as follows: three reinforcing ribs are provided and extend respectively from the three corners of the triangular plate toward the center of the triangular plate; a fixed sleeve is fixedly connected to the center of the triangular plate; the reinforcing ribs gradually increase in height along the direction toward the fixed sleeve and are fixedly connected to the outer wall of the fixed sleeve; connecting parts are provided on both sides of the protective plate and the connecting parts on both sides correspond one to one; the seepage pipe is fixedly connected to the fixed sleeve on the side of the protective plate close to the support plate.

[0014] The present invention is further configured as follows: both sides of the seepage pipe located on the support plate are threadedly connected with limiting bolts.

[0015] The present invention is further configured as follows: a plurality of connecting plates are fixedly connected between the fixing plates of two adjacent tension stop members, the plurality of connecting plates are evenly distributed along the length direction of the fixing plates, and the connecting plates are all provided with anchor rods drilled into the ground.

[0016] The present invention is further configured as follows: a check piece is provided on the seepage tube, the check piece includes a through groove opened at the bottom of the seepage tube and a check plate hinged in the through groove, the through groove extends along the length direction of the seepage tube, the check plate cooperates with the through groove and has a fan-shaped cross-section, the end of the check plate away from the support assembly is hinged in the through groove, the check plate flips over and closes the through groove, the end of the check plate away from the outside of the seepage tube is provided with a check block, the check block is ratchet-shaped, and its tip is inclined toward the direction of the support assembly.

[0017] The beneficial effects of the present invention are: 1. By setting up support plates, retaining plates and several seepage pipes, when it rains, after rainwater seeps into the ground, the water is guided between the support plates and retaining plates through the seepage holes of several seepage pipes, and then discharged through the drainage ditch at the bottom of the foundation pit body, so that the side walls around the foundation pit body remain relatively dry, ensuring the integrity of the soil structure and reducing the possibility of collapse; 2. By setting a stopper at the top of the side wall of the foundation pit body and connecting two adjacent seepage pipes to the fixed plate by setting a Y-shaped connecting sleeve, an inclined structure is formed between the retaining plate and the fixed plate, which ensures the stability of the retaining plate and also makes the side wall of the foundation pit body more stable. When the side wall of the foundation pit body is deformed during the excavation process, the adjusting bolt above the fixing rod can be operated to increase the tension on the seepage pipe and the retaining plate, adjust the state of the retaining plate, and ensure that the deformation state of the side wall of the foundation pit body will not have a significant impact; 3. By setting the enclosure plate to be composed of a plurality of plate units and a plurality of brackets, when supporting the side wall of the foundation pit body, the support plate is first attached to the side wall of the foundation pit body, and the bottom bracket is first inserted into the positioning groove on the horizontal plate, and the plate units are installed layer by layer in sequence, and finally, each three adjacent plate units are connected and reinforced by setting a connecting piece, so that the plurality of plate units form a whole. When one of the plate units is damaged, only one of them can be replaced, which has low maintenance cost and high structural strength; 4. By further arranging anchor rods between two adjacent tension stoppers, the fixing plates in the tension stoppers are integrated, and the connection between the tension stoppers and the ground is strengthened by the anchor rods, so that the tension stoppers are more stable relative to the foundation pit body; 5. When the side wall of the foundation pit partially collapses, the displacement of the seepage pipe caused by the lateral tension will trigger the dual action mechanism of the check piece: First, the inclined design of the ratchet-shaped check block generates a rotational torque under the reaction of the soil, forcing the fan-shaped check plate to unfold around the hinge axis to form an umbrella-shaped support structure, and the contact area with the soil can be expanded to 3-5 times that of the initial state. The device can complete the transition from closed to maximum expansion state in a short time, and its dynamic impedance increases exponentially with the displacement, effectively controlling the displacement of the support component within the safety threshold. This self-triggered tensile mechanism significantly improves the reliability of the support system under sudden loads and solves the technical problem of brittle failure of traditional rigid support structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the overall structure of the first embodiment of the present invention.

[0019] Figure 2It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the back side of the support plate in the first embodiment of the present invention.

[0021] Figure 4 This Figure 2 A partial enlarged view of part A.

[0022] Figure 5 It is a schematic diagram of the structure of the seepage pipe in the second embodiment of the present invention.

[0023] Figure 6 It is a force diagram of the seepage pipe in the second embodiment of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the return stop member in the second embodiment of the present invention in the unfolded state.

[0025] In the figure: 1. foundation pit body; 2. support plate; 3. enclosure plate; 4. cross plate; 5. positioning groove; 6. drainage ditch; 7. drainage hole; 8. sand and gravel particles; 9. connecting piece; 10. seepage pipe; 11. limit bolt; 12. water outlet hole; 13. seepage hole; 14. tension stop; 15. fixing plate; 16. Y-type connecting sleeve; 17. fixing rod; 18. V-type pipe sleeve; 19. connecting hole; 20. adjusting bolt; 21. plate unit; 22. bracket; 23. cross bar; 24. longitudinal bar; 25. C-type bar; 26. connecting plate; 27. anchor rod; 28. triangle plate; 29. ​​reinforcing rib; 30. fixing sleeve; 31. check piece; 32. through groove; 33. check plate; 34. check block. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0027] Embodiment 1: like Figure 1-Figure 4 As shown, a deep foundation pit water-stopping excavation device includes a foundation pit body 1, a supporting assembly arranged on the side wall of the foundation pit body 1, wherein the supporting assembly includes a supporting plate 2 attached to the side wall of the foundation pit body 1, and a retaining plate 3 arranged on the side of the supporting plate 2 away from the side wall of the foundation pit body 1, a horizontal plate 4 extending toward the retaining plate 3 is fixedly connected to the bottom of the support plate 2, a positioning groove 5 is provided on the top surface of the horizontal plate 4, and the bottom of the retaining plate 3 is slidably inserted into the positioning groove 5.

[0028] To facilitate the discharge of water, drainage ditches 6 are opened around the bottom surface of the foundation pit body 1. The drainage ditch 6 is located between the support plate 2 and the retaining plate 3. A number of drainage holes 7 are opened in the part of the cross plate 4 corresponding to the drainage ditch 6. The part between the support plate 2 and the retaining plate 3 is filled with sand and gravel particles 8.

[0029] A plurality of evenly distributed connecting parts 9 are provided on the side of the retaining plate 3 close to the side wall of the foundation pit body 1 and on the side away from the side wall of the foundation pit body 1. A seepage pipe 10 passing through the support plate 2 and extending to the side wall of the foundation pit body 1 is fixedly connected to the connecting part 9 on the inner side of the retaining plate 3. The seepage pipe 10 is located on both sides of the support plate 2 and is threadedly connected with limiting bolts 11. A water outlet hole 12 is provided in the portion of the seepage pipe 10 located between the support plate 2 and the retaining plate 3. The portion of the seepage pipe 10 located on the side wall of the foundation pit body 1 extends toward the ground, and a plurality of seepage holes 13 are provided on the seepage pipe 10.

[0030] In order to further improve the stability of the retaining plate 3, a tension stopper 14 is provided on the top surface of the side wall of the foundation pit body 1. The tension stopper 14 includes a fixed plate 15 embedded in the ground on one side of the top of the foundation pit body 1, and a plurality of Y-shaped connecting sleeves 16 connected to the fixed plate 15. The Y-shaped connecting sleeve 16 includes a fixed rod 17 connected to the fixed plate 15 and a V-shaped pipe sleeve 18 connected to the bottom of the fixed rod 17. The seepage pipes 10 are divided into several rows in the depth direction of the foundation pit body 1. The tension stopper 14 is provided with several groups in the direction away from the foundation pit body 1 and corresponds to each row of seepage pipes 10 one by one. The topmost row of seepage pipes 10 is correspondingly connected to the tension stopper 14 closest to the foundation pit body 1. The fixed plate 15 extends along the side length direction of the foundation pit body 1. The plurality of Y-shaped connecting sleeves 16 are evenly distributed along the length direction of the fixed plate 15. Two adjacent seepage pipes 10 in the same row are connected to the same V-shaped pipe sleeve 18, and the end of the seepage pipe 10 close to the ground is fixedly connected to the V-shaped pipe sleeve 18.

[0031] In order to facilitate the adjustment of the pulling force on the seepage tube 10, a connecting hole 19 is opened on the fixing plate 15 corresponding to the fixing rod 17. The fixing rod 17 is slidably inserted into the connecting hole 19. The top end of the fixing rod 17 passes through the fixing plate 15 and extends to the top of the fixing plate 15 and is threadedly connected with an adjusting bolt 20. The bottom end of the fixing rod 17 is hingedly connected to the top of the V-shaped pipe sleeve 18.

[0032] By setting a tension stop 14 at the top of the side wall of the foundation pit body 1, and by setting a Y-shaped connecting sleeve 16 to connect the two adjacent seepage pipes 10 with the fixed plate 15, a diagonal structure is formed between the retaining plate 3 and the fixed plate 15, thereby ensuring the stability of the retaining plate 3 and making the side wall of the foundation pit body 1 more stable. When the foundation pit body 1 is being excavated, if the side wall of the foundation pit body 1 is deformed, the adjusting bolt 20 above the operating fixing rod 17 can be used to increase the tension on the seepage pipe 10 and the retaining plate 3, adjust the state of the retaining plate 3, and ensure that the deformation state of the side wall of the foundation pit body 1 will not be greatly affected.

[0033] The enclosure plate 3 includes a plurality of plate units 21 and a plurality of brackets 22 for connecting adjacent plate units 21. The plurality of plate units 21 are divided into a plurality of rows in the depth direction of the foundation pit body 1, and the plate units 21 of two adjacent rows are staggered in the arrangement direction. The bracket 22 includes a cross bar 23 and a longitudinal bar 24 fixedly connected to the upper middle part of the cross bar 23. The longitudinal bar 24 is perpendicular to the cross bar 23, and the cross bars 23 and the longitudinal bars 24 are both I-shaped in cross section. The length of the longitudinal bar 24 is equal to the height of the plate unit 21, and the length of the cross bar 23 is equal to the width of the plate unit 21. The bottoms of two adjacent plate units 21 are respectively plugged into the upper part of the cross bar 23 and are respectively located on both sides of the longitudinal bar 24. The tops of the adjacent plate units 21 located in the lower layer are plugged into the lower part of the cross bar 23, and the top of the uppermost plate unit 21 is buckled and fixedly connected with a C-shaped bar 25.

[0034] By configuring the enclosure plate 3 to be composed of a plurality of plate units 21 and a plurality of brackets 22, when supporting the side wall of the foundation pit body 1, the support plate 2 is first attached to the side wall of the foundation pit body 1, and the bottom bracket 22 is first inserted into the positioning groove 5 on the horizontal plate 4, and the plate units 21 are installed layer by layer in sequence, and finally, by configuring the connecting piece 9, each three adjacent plate units 21 are connected and reinforced, so that the plurality of plate units 21 form a whole. When one of the plate units 21 is damaged, only one of them can be replaced, and the maintenance cost is low and the structural strength is high.

[0035] In order to improve the stability between the fixed plates 15 and the ground, a number of connecting plates 26 are fixedly connected between the fixed plates 15 of two adjacent tension stop members 14. The number of connecting plates 26 are evenly distributed along the length direction of the fixed plates 15. The connecting plates 26 are pierced with anchor rods 27 drilled into the ground. Anchor rods 27 are further arranged between two adjacent tension stop members 14, so that the fixed plates 15 in the number of tension stop members 14 form a whole, and the connection between the tension stop members 14 and the ground is strengthened by the anchor rods 27, so that the tension stop members 14 are more stable relative to the foundation pit body 1.

[0036] The connector 9 is connected one by one between each three adjacent groups of brackets 22. The connector 9 includes a triangular plate 28 and a reinforcing rib 29 fixedly connected to one side of the triangular plate 28. The triangular plate 28 covers the connection between the three adjacent groups of brackets 22, and the three corners of the triangular plate 28 correspond to the three adjacent plate units 21 and are locked with the plate units 21 by bolts. There are three reinforcing ribs 29, which extend from the three corners of the triangular plate 28 toward the center of the triangular plate 28, respectively. A fixed sleeve 30 is fixedly connected to the center of the triangular plate 28. The height of the reinforcing rib 29 gradually increases in the direction toward the fixed sleeve 30 and is fixedly connected to the outer wall of the fixed sleeve 30. Connectors 9 are provided on both sides of the enclosure 3 and the connectors 9 on both sides correspond one by one. The seepage pipe 10 is fixedly connected to the fixed sleeve 30 on the side of the enclosure 3 close to the support plate 2.

[0037] Embodiment 2: like Figure 5 As shown, the difference from Example 1 is that a check piece 31 is provided on the seepage pipe 10, the seepage hole 13 is located at the top of the seepage pipe 10, and the check piece 31 is located at the bottom of the seepage pipe 10. The check piece 31 includes a through groove 32 opened at the bottom of the seepage pipe 10 and a check plate 33 hinged in the through groove 32. The through groove 32 extends along the length direction of the seepage pipe 10. The check plate 33 cooperates with the through groove 32 and has a fan-shaped cross-section. The end of the check plate 33 away from the support assembly is hinged in the through groove 32, the check plate 33 flips over and closes the through groove 32, and the end of the check plate 33 away from the outside of the seepage pipe 10 is provided with a check block 34. The check block 34 is ratchet-shaped, and its tip is inclined toward the direction of the support assembly.

[0038] like Figure 6 As shown in the figure, due to construction reasons, especially earth excavation construction, it is easy to disturb the surrounding soil, resulting in soil structure damage and stress distribution changes. Factors such as mechanical excavation and soil deflection during construction may also cause the soil layer to become loose. As time goes by, the soil stress gradually weakens, the soil shear strength decreases, and the soil becomes consolidated, compacted and deformed, eventually causing longitudinal cracks in the soil or local collapse on the upper side of the foundation pit.

[0039] When the side wall of the foundation pit body 1 partially collapses, the soil near the support plate 2 moves toward the inside of the foundation pit body 1, generating pressure on the support plate 2, so that the seepage pipe 10 is subjected to lateral tension, resulting in a relative displacement with the soil along direction a, thereby triggering the dual action mechanism of the check piece 31: first, the inclined surface design of the ratchet-shaped check block 34 enables it to generate a rotational torque under the reaction force of the soil, forcing the fan-shaped check plate 33 to gradually expand along direction b. When the check plate 33 is in the process of expanding, the contact area with the soil increases, and the force exerted by the soil gradually increases, causing the check plate to penetrate into the surrounding soil. Figure 7 As shown, an umbrella-shaped support structure is eventually formed, and the contact area with the soil can be expanded to 3-5 times that of the initial state.

[0040] The device can complete the transition from closed to maximum expansion in a short time, and its dynamic impedance increases exponentially with displacement, effectively controlling the displacement of the support component within the safety threshold. This self-triggered tensile mechanism significantly improves the reliability of the support system under sudden loads and solves the technical problem of brittle failure of traditional rigid support structures.

[0041] The implementation principle of the present invention is: During construction and installation, the method of pre-drilling and then installation is adopted, that is, first use a total station or other precise positioning tools to determine the center and the central axis position of the installation hole, calibrate the positions of the two ends of the seepage pipe 10, and after the installation hole is drilled by a drill rig, dig an installation pit for the stop member 14 on the ground, bury the stop member 14 and then backfill it to make the V-shaped pipe sleeve 18 correspond to each installation hole, and then the seepage pipe 10 is introduced from the inner wall of the foundation pit body 1 and connected to the V-shaped pipe sleeve 18 by chemical bonding. After the installation of the seepage pipe 10 is completed, the support assembly is finally installed to complete the construction.

[0042] During precipitation, after rainwater seeps into the ground, the water is directed between the support plate 2 and the retaining plate 3 through the seepage holes 13 of a number of seepage pipes 10, and is discharged through the drainage ditch 6 at the bottom of the foundation pit body 1, so that the side walls around the foundation pit body 1 remain relatively dry, ensuring the integrity of the soil structure and reducing the possibility of collapse.

[0043] In addition, a tension stopper 14 is arranged on the top of the side wall of the foundation pit body 1, and two adjacent seepage pipes 10 are connected to the fixed plate 15 by arranging a Y-shaped connecting sleeve 16, thereby forming a diagonal structure between the retaining plate 3 and the fixed plate 15, which ensures the stability of the retaining plate 3 and also makes the side wall of the foundation pit body 1 more stable.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A deep foundation pit water-stopping excavation device, comprising a foundation pit body (1), and a support assembly arranged on the side wall of the foundation pit body (1), characterized in that: The support assembly is evenly provided with a plurality of seepage pipes (10) penetrating into the side wall of the foundation pit body (1), and the seepage pipes (10) are provided with a plurality of seepage holes (13); A stopper (14) is provided on the top surface of the side wall of the foundation pit body (1), and the stopper (14) comprises a fixing plate (15) embedded in the ground on one side of the top of the foundation pit body (1), and a plurality of Y-shaped connecting sleeves (16) connected to the fixing plate (15); the Y-shaped connecting sleeve (16) comprises a fixing rod (17) connected to the fixing plate (15), and a V-shaped pipe sleeve (18) connected to the bottom of the fixing rod (17); the bottom end of the fixing rod (17) is hingedly connected to the top end of the V-shaped pipe sleeve (18); and the end of the seepage pipe (10) close to the ground extends upward and is fixedly connected to the V-shaped pipe sleeve (18).

2. A deep foundation pit water-stopping excavation device according to claim 1, characterized in that: The seepage pipes (10) are divided into several rows in the depth direction of the foundation pit body (1); the tension members (14) are provided in several groups in the direction away from the foundation pit body (1) and correspond one-to-one to each row of the seepage pipes (10); the topmost row of the seepage pipes (10) is correspondingly connected to the tension members (14) closest to the foundation pit body (1); the fixing plate (15) extends along the side length direction of the foundation pit body (1); a plurality of the Y-shaped connecting sleeves (16) are evenly distributed along the length direction of the fixing plate (15); and two adjacent seepage pipes (10) in the same row are connected to the same V-shaped pipe sleeve (18).

3. A deep foundation pit water-stopping excavation device according to claim 2, characterized in that: The support assembly comprises a support plate (2) attached to the side wall of the foundation pit body (1), and a retaining plate (3) arranged on the side of the support plate (2) away from the side wall of the foundation pit body (1); a plurality of evenly distributed connecting pieces (9) are arranged on the side of the retaining plate (3) close to the side wall of the foundation pit body (1); and the seepage pipes (10) pass through the support plate (2) and are fixedly connected to the connecting pieces (9) in a one-to-one correspondence. The bottom of the support plate (2) is fixedly connected with a transverse plate (4) extending toward the enclosure plate (3); the top surface of the transverse plate (4) is provided with a positioning groove (5), and the bottom of the enclosure plate (3) is slidably inserted into the positioning groove (5); The bottom surface of the foundation pit body (1) is provided with drainage ditches (6) around the periphery, and the drainage ditches (6) are located between the support plate (2) and the enclosure plate (3). The seepage pipe (10) is provided with a water outlet hole (12) at a portion located between the support plate (2) and the enclosure plate (3). The portion of the transverse plate (4) corresponding to the drainage ditches (6) is provided with a plurality of drainage holes (7), and the portion between the support plate (2) and the enclosure plate (3) is filled with sand and gravel particles (8).

4. A deep foundation pit water-stopping excavation device according to claim 1, characterized in that: The fixing plate (15) is provided with a connecting hole (19) corresponding to the fixing rod (17), and the fixing rod (17) is slidably inserted into the connecting hole (19). The top end of the fixing rod (17) passes through the fixing plate (15) and extends to the top of the fixing plate (15) and is threadedly connected with an adjusting bolt (20).

5. A deep foundation pit water-stopping excavation device according to claim 3, characterized in that: The enclosure plate (3) comprises a plurality of plate units (21) and a plurality of brackets (22) for connecting adjacent plate units (21), wherein the plurality of plate units (21) are divided into a plurality of rows in the depth direction of the foundation pit body (1), and the plate units (21) of two adjacent rows are arranged in a staggered manner in the arrangement direction, and the bracket (22) comprises a cross bar (23) and a longitudinal bar (24) fixedly connected to the upper middle portion of the cross bar (23), wherein the longitudinal bar (24) is perpendicular to the cross bar (23), and the cross bar (23) and the longitudinal bar (24) both have an I-shaped cross section. The length of the longitudinal rod (24) is equal to the height of the plate unit (21), the length of the cross rod (23) is equal to the width of the plate unit (21), the bottoms of two adjacent plate units (21) are respectively plugged into the upper part of the cross rod (23) and are respectively located on both sides of the longitudinal rod (24), the top of the adjacent plate unit (21) located at the lower layer is plugged into the lower part of the cross rod (23), the top of the uppermost plate unit (21) is buckled and fixedly connected with a C-shaped rod (25), and the connecting piece (9) is connected one by one between each three adjacent groups of brackets (22).

6. A deep foundation pit water-stopping excavation device according to claim 5, characterized in that: The connecting member (9) comprises a triangular plate (28) and a reinforcing rib (29) fixedly connected to one side of the triangular plate (28); the triangular plate (28) is arranged to cover the connection between three adjacent groups of brackets (22); and the three corners of the triangular plate (28) respectively correspond to the three adjacent plate units (21) and are locked with the plate units (21) by bolts.

7. A deep foundation pit water-stopping excavation device according to claim 6, characterized in that: The reinforcing ribs (29) are provided in three numbers and extend respectively from three corners of the triangular plate (28) toward the center of the triangular plate (28); a fixing sleeve (30) is fixedly connected to the center of the triangular plate (28); the reinforcing ribs (29) gradually increase in height in the direction toward the fixing sleeve (30) and are fixedly connected to the outer wall of the fixing sleeve (30); connecting pieces (9) are provided on both sides of the enclosure plate (3) and the connecting pieces (9) on both sides correspond to each other one by one; the seepage pipe (10) is fixedly connected to the fixing sleeve (30) on the side of the enclosure plate (3) close to the support plate (2).

8. A deep foundation pit water-stopping excavation device according to claim 7, characterized in that: The seepage pipe (10) is located on both sides of the support plate (2) and is threadedly connected to limit bolts (11).

9. A deep foundation pit water-stopping excavation device according to claim 1, characterized in that: A plurality of connecting plates (26) are fixedly connected between the fixing plates (15) of two adjacent tension stop members (14), and the connecting plates (26) are evenly distributed along the length direction of the fixing plates (15). Anchor rods (27) drilled into the ground are penetrated through the connecting plates (26).

10. A deep foundation pit water-stopping excavation device according to claim 1, characterized in that: The seepage pipe (10) is provided with a check piece (31), the check piece (31) comprises a through groove (32) opened at the bottom of the seepage pipe (10), and a check plate (33) hinged in the through groove (32), the through groove (32) extends along the length direction of the seepage pipe (10), the check plate (33) cooperates with the through groove (32) and has a fan-shaped cross section, the end of the check plate (33) away from the support component is hinged in the through groove (32), the check plate (33) turns over and closes the through groove (32), and the end of the check plate (33) away from the outer side of the seepage pipe (10) is provided with a check block (34), the check block (34) is ratchet-shaped, and its tip is inclined toward the direction of the support component.

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