Foundation pit drainage facility for civil engineering construction

Abstract

The invention relates to the technical field of foundation pit drainage, and discloses a foundation pit drainage facility for civil engineering construction, which comprises a foundation pit, a foundation pit high ridge is arranged at the center of the bottom of the foundation pit, a drainage channel is formed in the wall-attached position of the periphery of the foundation pit, a plurality of foundation pit flat ridges are arranged in the channel, and the structure is used for guiding accumulated water and realizing step-by-step pre-sedimentation of silt; the water taking groove is formed in the corner of the foundation pit and used for collecting the settled water flow; and the filtering mechanism is mounted in the water taking tank. The filtering mechanism has double self-cleaning functions: an outer cleaning assembly is arranged on the outer side of an outer filtering assembly, and a cleaning ring is driven by water flow to rotate to clean large impurities; an inner cleaning assembly is arranged in the inner filtering assembly, and an impeller and a cleaning roller are driven by water flow to rotate so as to brush fine filtering holes. The water pump is arranged at the top of the foundation pit and connected with the filtering mechanism through a pumping pipe. Through the design of source sedimentation, double filtration self-cleaning and pump filtration separation, blockage and abrasion are effectively prevented, and maintenance work is greatly simplified.

Description

Technical Field

[0001] This invention relates to the field of foundation pit drainage technology, specifically to a foundation pit drainage facility for civil engineering construction. Background Technology

[0002] Currently, in the field of civil engineering construction, foundation pit excavation is a fundamental and crucial process. Since most foundation pits are located below the groundwater level, groundwater seepage and surface rainfall inevitably accumulate inside. If not drained promptly, the accumulated water will soften the soil at the bottom of the pit, reducing its bearing capacity and potentially causing slope instability or collapse. Simultaneously, the waterlogged environment will severely hinder subsequent foundation layer pouring and main structure construction. Therefore, installing an efficient and reliable foundation pit drainage system is a necessary prerequisite for ensuring the safety of foundation pit construction and maintaining the normal construction schedule.

[0003] Regarding the above-mentioned issues, existing drainage methods are widely used. Construction companies typically reserve or excavate a temporary sump in the lowest-lying area during foundation pit excavation. Water accumulating in the foundation pit slowly flows into this sump due to the natural slope of the excavation face or through the excavated temporary drainage ditch. Inside the sump, one or more submersible pumps are placed directly. When the water level in the sump rises to a preset height, the float switch of the submersible pump automatically closes, the pump starts, and the water in the pit is directly pumped out of the foundation pit through flexible hoses.

[0004] However, traditional foundation pit floor and trench designs are very crude. They lack the ability to pre-treat solid impurities in the water flow. All the silt, mud and fine sand in the foundation pit are carried by the water flow and directly collect to the bottom of the sump without any obstruction. This makes the pumping point, i.e. the location of the submersible pump, the area with the highest sludge concentration in the entire foundation pit.

[0005] Furthermore, the filters on the submersible pumps are extremely rudimentary and ineffective at blocking fine sand and silt. Floating debris commonly found at construction sites, such as plastic bags and wood chips, easily attract and clog the filters, causing rapid blockage of the inlet and resulting in the pump running dry and burning out. Moreover, the pumps must operate completely submerged in this highly concentrated mud, with large amounts of abrasive mud particles being drawn into the pump body at high speed, causing severe mechanical wear on the impeller and pump chamber, resulting in a very short lifespan and a high failure rate. Once a submersible pump fails due to blockage or wear, maintenance becomes extremely difficult and dangerous. Maintenance personnel must lift the heavy, foul-smelling sludge-covered pump from several meters deep into murky water; the cleaning or repair process is time-consuming and labor-intensive, severely delaying drainage progress. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a foundation pit drainage facility for civil engineering construction. Existing foundation pit drainage facilities suffer from problems such as the lack of pre-settling of silt and effective filtration, which leads to submersible pumps being easily clogged by debris, severely worn by silt, and difficult maintenance after equipment failure.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a foundation pit drainage facility for civil engineering construction, comprising a foundation pit, a high sill set at the center of the foundation pit, drainage channels provided along the walls of the foundation pit, and water intake troughs vertically provided at opposite corners of the foundation pit, the water intake troughs being equipped with a filtration mechanism for filtering the accumulated water therein; the drainage channels being inclined at an angle toward the water intake troughs for collecting the accumulated water inside the foundation pit, and multiple foundation pit sills being equidistantly provided at the top of the drainage channels;

[0008] The filtration mechanism includes an inner filter assembly, an outer filter assembly on the outside of the inner filter assembly, an outer cleaning assembly on the outside of the outer filter assembly, an inner cleaning assembly inside the inner filter assembly, and an inner tube. The inner tube has an internal thread on its inner top side, and three T-shaped sliders are mounted around the outer side of the inner tube. The top of the T-shaped sliders is fixedly connected to a limit block, and the sidewall of the inner tube has multiple fine filter holes.

[0009] Preferably, the external filter assembly includes an outer tube, the sidewall of which has a plurality of coarse filter holes, the inner side of which has three T-shaped grooves, and the outer side of which has two rotating grooves.

[0010] Preferably, the T-shaped slider is slidably connected inside the T-shaped groove, and the bottom of the limiting block abuts against the top of the outer tube.

[0011] Preferably, the external cleaning component includes a cleaning ring, the sidewall of which has multiple cleaning grooves, two rotating rings are horizontally mounted around the inner side of the cleaning ring, and multiple water flow blocking blocks are fixedly connected around the outer side of the cleaning ring.

[0012] Preferably, the rotating ring is rotatably connected inside the rotating groove.

[0013] Preferably, the internal cleaning assembly includes a filter basket, the top of which is fixedly connected to a mounting ring, the outer side of which abuts against the inner wall of the inner tube, a cleaning roller is disposed inside the mounting ring, a rotating shaft is installed inside the cleaning roller, and an impeller is installed at the bottom of the rotating shaft.

[0014] Preferably, a counterweight is fixedly connected to the bottom of the outer tube, and the counterweight is located inside the water intake tank.

[0015] Preferably, a water pipe connector is threaded to the top of the inner tube, and a water pumping pipe is installed at the end of the water pipe connector away from the inner tube.

[0016] Preferably, a water pump is provided on one side of the top of the foundation pit, the input end of the water pump is installed at the end of the pumping pipe away from the water pipe connector, and the output end of the water pump is equipped with an outlet pipe.

[0017] Preferably, the length of the T-shaped slider is less than the length of the T-shaped groove.

[0018] This invention provides a foundation pit drainage facility for civil engineering construction. It has the following beneficial effects:

[0019] 1. This invention achieves effective water collection by setting a central high sill and wall-mounted channels inside the foundation pit; the foundation pit level sills set at equal intervals in the diversion channels construct a multi-stage settling system. As the water flows towards the intake channel, the flow velocity is slowed down by the level sills, causing large particles of silt and heavy sand in the water to settle and separate step by step in the channels. This greatly reduces the amount of solid impurities entering the subsequent filtration mechanism, fundamentally avoiding the risk of the filtration device being blocked by a large amount of silt, and extending the maintenance cycle.

[0020] 2. The filtration mechanism of the present invention utilizes water vortex to drive the external cleaning component for the external filtration assembly, thereby rotating the cleaning ring and continuously scraping the coarse filter holes of the outer tube to prevent large debris from adhering and clogging. For the internal filtration assembly, the water flowing into the filter basket impacts the impeller at the bottom, and the impeller drives the cleaning roller to rotate via the rotating shaft, continuously brushing the fine filter holes of the inner tube. This filtration mechanism is self-driven by water power, requiring no additional energy consumption, and can continuously prevent clogging, ensuring filtration efficiency.

[0021] 3. This invention places the water pump on the ground at the top of the foundation pit, while the filtration mechanism is placed inside the water intake tank. The water pump draws highly purified water that has undergone trench settling and dual self-cleaning filtration. This pump and water intake separation design prevents the pump impeller and pump chamber from contacting abrasive particles such as mud and sand, solving the problem of frequent damage due to wear in traditional submersible pumps and greatly extending the equipment's lifespan. Simultaneously, the cooperation between the T-shaped slider and the T-shaped groove allows the inner filter assembly to be easily lifted and removed from the outer filter assembly, greatly simplifying maintenance and repair work. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a schematic diagram of the internal structure of the foundation pit of the present invention;

[0024] Figure 3This is a schematic diagram of the water pumping pipe of the present invention;

[0025] Figure 4 This is a schematic diagram of the counterweight block of the present invention;

[0026] Figure 5 This is a schematic diagram of the filtration mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal filter assembly of the present invention;

[0028] Figure 7 This is a schematic diagram of the external filter assembly of the present invention;

[0029] Figure 8 This is a schematic diagram of the internal cleaning component of the present invention.

[0030] The components include: 1. Excavation pit; 2. Drainage channel; 3. Water pump; 4. Pumping pipe; 5. Outlet pipe; 6. Excavation pit sill; 7. Excavation pit level sill; 8. Water intake trough; 9. Filtration mechanism; 91. Internal filter assembly; 911. Inner tube; 912. T-shaped slider; 913. Limiting block; 914. Internal thread; 915. Fine filter hole; 92. External filter assembly; 921. Outer tube; 922. T-shaped groove; 923. Coarse filter hole; 924. Rotating groove; 93. External cleaning assembly; 931. Cleaning ring; 932. Water flow blocking block; 933. Rotating ring; 934. Cleaning groove; 94. Internal cleaning assembly; 941. Mounting retaining ring; 942. Filter basket; 943. Impeller; 944. Rotating shaft; 945. Cleaning roller; 10. Counterweight; 11. Water pipe connector. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see the appendix Figure 1 - Appendix Figure 8 This invention provides a foundation pit drainage facility for civil engineering construction, including a foundation pit 1, wherein a foundation pit sill 6 is provided at the center of the interior of the foundation pit 1;

[0033] Specifically, improvements were made to the overall structure of foundation pit 1. A high embankment 6 was installed in the center of foundation pit 1, giving the natural ground level of foundation pit 1 a specific shape of "high in the middle and low around the edges". This shape actively guides surface precipitation or groundwater infiltration to flow naturally and quickly to the walls around foundation pit 1 under the action of gravity, effectively preventing water from accumulating in the central area of ​​foundation pit 1.

[0034] The pit 1 is provided with drainage channels 2 at the inner wall, and a water intake trough 8 is provided vertically at the diagonal of the pit 1. The drainage channels 2 are inclined toward the water intake trough 8 to collect the water inside the pit 1. The top of the drainage channels 2 is provided with multiple pit sills 7 at equal intervals.

[0035] Specifically, a drainage channel 2 is constructed around the wall of the foundation pit 1. This drainage channel 2 is not a simple horizontal ditch, but has a continuous water intake trough 8 with a slight inclination towards the diagonal corner of the foundation pit 1. This ensures that all the scattered water can be guided and collected in an orderly manner to the single, lowest pumping point, namely the water intake trough 8.

[0036] At the top of the diversion channel 2, along the inevitable path of the water flow, multiple pit sills 7 are constructed at equal intervals. These pit sills 7 form a multi-stage stepped sedimentation tank structure within the diversion channel 2. When turbid water carrying a large amount of silt flows within the diversion channel 2, whenever it encounters a pit sill 7, the water flow needs to cross that sill, and its velocity will suddenly slow down at this point, forming a brief still water zone behind the pit sill 7. Heavy particles in the water flow, such as silt, fine sand, and other impurities, will rapidly settle in these still water zones due to the instantaneous loss of kinetic energy. After crossing one pit sill 7, the water flow will accelerate again and flow to the next pit sill 7, repeating this sedimentation process. Therefore, when the accumulated water finally reaches the water intake tank 8, it has undergone multiple physical sedimentation and separation processes. Most of the solid impurities have been pre-intercepted in the diversion channel 2, which greatly improves the water quality entering the water intake tank 8, thereby significantly reducing the purification load and clogging pressure of the internal filtration mechanism 9 of the water intake tank 8.

[0037] The water intake tank 8 is equipped with a filter mechanism 9 for filtering the collected water. The filter mechanism 9 includes an inner filter assembly 91, an outer filter assembly 92 on the outside of the inner filter assembly 91, an outer cleaning assembly 93 on the outside of the outer filter assembly 92, and an inner cleaning assembly 94 inside the inner filter assembly 91. The inner filter assembly 91 includes an inner tube 911 with an internal thread 914 on its inner top. Three T-shaped sliders 912 are mounted around the outer side of the inner tube 911, and a limit block 913 is fixedly connected to the top of each T-shaped slider 912. Multiple fine filter holes 915 are formed on the sidewall of the inner tube 911. The outer filter assembly 92 includes an outer tube 921 with multiple coarse filter holes 923 on its sidewall. Three T-shaped grooves 922 are formed around the inner side of the outer tube 921, and the T-shaped sliders 912 are slidably connected inside the T-shaped grooves 922. The bottom of the limiting block 913 abuts against the top of the outer tube 921. The length of the T-shaped slider 912 is less than the length of the T-shaped groove 922. Two rotating grooves 924 are horizontally arranged around the outer side of the outer tube 921. The outer cleaning assembly 93 includes a cleaning ring 931. Multiple cleaning grooves 934 are provided on the side wall of the cleaning ring 931. Two rotating rings 933 are horizontally installed around the inner side of the cleaning ring 931. Multiple water flow blocking blocks 932 are fixedly connected around the outer side of the cleaning ring 931. The rotating rings 933 are rotatably connected inside the rotating grooves 924. The inner cleaning assembly 94 includes a filter basket 942. A mounting ring 941 is fixedly connected to the top of the filter basket 942. The outer side of the mounting ring 941 abuts against the inner wall of the inner tube 911. A cleaning roller 945 is provided inside the mounting ring 941. A rotating shaft 944 is installed inside the cleaning roller 945. An impeller 943 is installed at the bottom of the rotating shaft 944.

[0038] Specifically, the filtration mechanism 9 features dual internal and external filtration and a fully passive self-cleaning function, enabling long-term stable filtration without the need for additional power sources or manual intervention. When the pre-sedimented water flows into the intake tank 8, the water first comes into contact with the outer pipe 921 of the external filtration assembly 92. Multiple coarse filter holes 923 are provided on the side wall of this outer pipe 921, with a diameter sufficient to intercept large floating objects and debris such as stones, wood chips, and plastic bags in the water. To prevent these large debris from adhering to the surface of the outer pipe 921 and clogging the coarse filter holes 923 under the suction of the water pump 3, an external cleaning assembly 93 is installed on the outside of the outer pipe 921.

[0039] The cleaning ring 931 inside the outer cleaning component 93 is precisely fitted into the two rotating grooves 924 on the outside of the outer tube 921 through two rotating rings 933 on its inner side, forming a ring structure that can rotate freely around the outer tube 921. When the accumulated water flows into the drainage channel 2 and spirals down to the water intake tank 8, the water vortex formed will impact the multiple water flow blocking blocks 932 fixed on the outside of the cleaning ring 931, thereby driving the entire cleaning ring 931 to rotate. The cleaning grooves 934 are provided on the side wall of the cleaning ring 931, which will continuously brush or scrape the outer surface of the coarse filter holes 923 during the rotation, actively removing the attached substances and achieving the first layer of self-cleaning.

[0040] The water flowing through the coarse filter hole 923 has now removed large debris and enters the annular gap between the outer pipe 921 and the inner pipe 911, and then flows to the inner pipe 911 of the inner filter assembly 91. The inner pipe 911 has multiple fine filter holes 915 with smaller diameters on its side wall for fine filtration to intercept fine sand, silt or chemical sediments.

[0041] To prevent these fine particles from clogging the fine filter pores 915, an internal cleaning assembly 94 is installed inside the inner tube 911. The main body of this assembly is a cleaning roller 945 mounted on a rotating shaft 944. An impeller 943 is fixedly connected to the bottom of the rotating shaft 944 inside the assembly. The impeller 943 is located at the bottom of the filter basket 942, facing the path of the water flow. When the water pump 3 starts pumping water, the water flow is forced to pass through the fine filter pores 915 at high speed and rush into the inner tube 911. This water flow impacts the impeller 943, causing it to rotate. The rotation of the impeller 943 drives the cleaning roller 945 to rotate synchronously through the rotating shaft 944. The bristles of the cleaning roller 945 are in close contact with the inner wall of the inner tube 911, continuously and in real time cleaning the inner surface of the fine filter pores 915, ensuring that the mesh is always unobstructed. This dual self-cleaning system relies on the kinetic energy of the water flow itself for passive driving. It has a reliable structure and achieves maintenance-free, uninterrupted, and highly efficient filtration.

[0042] The top of the inner tube 911 is threaded with a water pipe connector 11. A water pump 4 is installed at the end of the water pipe connector 11 away from the inner tube 911. A water pump 3 is installed on one side of the top of the pit 1. The input end of the water pump 3 is installed at the end of the water pump 4 away from the water pipe connector 11. A water outlet pipe 5 is installed at the output end of the water pump 3.

[0043] Specifically, the water pump 3 is installed on a safe surface at the top of the pit 1, rather than being submerged in mud and water as in the traditional method; the water pump 3's inlet is connected to the top of the inner tube 911 of the filter mechanism 9 via a pumping pipe 4 and a water pipe connector 11. For this purpose, the top of the inner tube 911 is specially provided with an internal thread 914 for a quick and sealed threaded connection with the water pipe connector 11.

[0044] The pump-filtration separation ensures that the water pump 3 draws highly purified water that has undergone three processes: trench settling, coarse filtration in the outer tube, and fine filtration in the inner tube, followed by self-cleaning. This clean water contains almost no solid abrasive particles such as silt, thus completely avoiding "sandpaper-like" wear on the internal impeller and pump chamber of the water pump 3. This results in high equipment reliability and a service life several times longer than that of traditional submersible pumps 3. In addition, the filter mechanism 9 itself has a modular plug-in structure. The inner side of the outer tube 921 has three T-shaped grooves 922 along the axial direction, while the outer side of the inner tube 911 is correspondingly surrounded by three T-shaped sliders 912, allowing the inner filter assembly 91 to slide precisely into the interior of the outer filter assembly 92 along the guide of the T-shaped grooves 922. The limiting block 913 at the top of the T-shaped slider 912 abuts against the top of the outer tube 921 after the inner tube 911 is fully inserted, thereby achieving precise positioning.

[0045] The counterweight 10 at the bottom of the outer tube 921 ensures the stability of the entire "outer shell" against water flow impact within the water intake tank 8. When maintenance is required, such as cleaning the inner cleaning assembly 94 or replacing the filter basket 942, maintenance personnel do not need to descend to the dangerous bottom of the pit 1. They only need to stop the water pump 3 on the ground, unscrew the water pipe connector 11, and then vertically lift the entire inner filter assembly 91 using a lifting ring (not shown, fixedly connected to the top of the inner tube 911); the T-shaped slider 912 acts as a guide within the T-slot 922, ensuring smooth lifting. The outer filter assembly 92 and the counterweight 10 remain within the water intake tank 8. Maintenance personnel can easily replace a spare inner filter assembly 91 on the ground and reinsert it, achieving "hot-swap" maintenance. The entire process is safe, convenient, and greatly reduces downtime.

[0046] Working principle: The water inside the foundation pit 1 is guided by the central foundation pit sill 6 and flows to the drainage channel 2 opened at the wall of the foundation pit 1. The water flows along the drainage channel 2, which is inclined towards the water intake trough 8, and flows through multiple foundation pit sills 7 in the drainage channel 2 before finally flowing into the water intake trough 8 opened at the opposite corner of the foundation pit 1. The water flowing into the water intake trough 8 first contacts the outermost cleaning component 93 of the filtration mechanism 9. The water flow impacts the water flow block 932, driving the cleaning ring 931 to rotate in the rotating groove 924 of the outer pipe 921 through the rotating ring 933 on its inner side. The water then passes through the coarse filter holes 923 on the side wall of the outer pipe 921 of the outer filter component 92 and enters the outer pipe 921 and the inner pipe 911. The gap between them; then, the water flows through the fine filter holes 915 on the side wall of the inner tube 911 of the inner filter assembly 91, enters the interior of the inner tube 911, and flows through the filter basket 942 of the inner cleaning assembly 94; the inflowing water impacts the impeller 943 installed at the bottom of the filter basket 942, the impeller 943 rotates and drives the rotating shaft 944, the rotating shaft 944 in turn drives the cleaning roller 945 to rotate inside the filter basket 942; the filtered water collects in the inner tube 911, the water pump 3 at the top of the pit 1 starts, and through the water pumping pipe 4 connected to its input end and the water pipe connector 11 connected to the internal thread 914 at the top of the inner tube 911, the water in the inner tube 911 is pumped out, and finally discharged through the water outlet pipe 5 at the output end of the water pump 3.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foundation pit drainage facility for civil engineering construction, comprising a foundation pit (1), characterized in that, The pit (1) has a pit sill (6) at its center. Drainage channels (2) are provided at the walls of the pit (1). Water intake troughs (8) are provided vertically at the diagonal corners of the pit (1). A filter mechanism (9) is installed inside the water intake trough (8) to filter the water collected therein. The drainage channels (2) are inclined at an angle toward the water intake trough (8) to collect the water inside the pit (1). Multiple pit sills (7) are provided at equal intervals at the top of the drainage channels (2). The filtration mechanism (9) includes an inner filter assembly (91), an outer filter assembly (92) is provided on the outside of the inner filter assembly (91), an outer cleaning assembly (93) is installed on the outside of the outer filter assembly (92), an inner cleaning assembly (94) is provided inside the inner filter assembly (91), the inner filter assembly (91) includes an inner tube (911), an internal thread (914) is provided on the top of the inner side of the inner tube (911), three T-shaped sliders (912) are installed around the outside of the inner tube (911), and a limit block (913) is fixedly connected to the top of the T-shaped sliders (912), and a plurality of fine filter holes (915) are provided on the side wall of the inner tube (911).

2. The foundation pit drainage facility for civil engineering construction according to claim 1, characterized in that, The external filter assembly (92) includes an outer tube (921), the side wall of which is provided with a plurality of coarse filter holes (923), the inner side of which is provided with three T-shaped grooves (922), and the outer side of which is provided with two rotating grooves (924) horizontally.

3. A foundation pit drainage facility for civil engineering construction according to claim 2, characterized in that, The T-shaped slider (912) is slidably connected inside the T-shaped groove (922), and the bottom of the limiting block (913) abuts against the top of the outer tube (921).

4. A foundation pit drainage facility for civil engineering construction according to claim 2, characterized in that, The external cleaning component (93) includes a cleaning ring (931), the side wall of which is provided with a plurality of cleaning grooves (934), two rotating rings (933) are horizontally mounted around the inner side of the cleaning ring (931), and a plurality of water flow blocking blocks (932) are fixedly connected around the outer side of the cleaning ring (931).

5. A foundation pit drainage facility for civil engineering construction according to claim 4, characterized in that, The rotating ring (933) is rotatably connected inside the rotating groove (924).

6. A foundation pit drainage facility for civil engineering construction according to claim 1, characterized in that, The internal cleaning assembly (94) includes a filter basket (942), the top of which is fixedly connected to a mounting ring (941). The outer side of the mounting ring (941) abuts against the inner wall of the inner tube (911). A cleaning roller (945) is provided inside the mounting ring (941). A rotating shaft (944) is installed inside the cleaning roller (945). An impeller (943) is installed at the bottom of the rotating shaft (944).

7. A foundation pit drainage facility for civil engineering construction according to claim 2, characterized in that, A counterweight (10) is fixedly connected to the bottom of the outer tube (921), and the counterweight (10) is located inside the water intake tank (8).

8. A foundation pit drainage facility for civil engineering construction according to claim 1, characterized in that, The top of the inner tube (911) is threaded with a water pipe connector (11), and a water pumping pipe (4) is installed at the end of the water pipe connector (11) away from the inner tube (911).

9. A foundation pit drainage facility for civil engineering construction according to claim 8, characterized in that, A water pump (3) is installed on one side of the top of the foundation pit (1). The input end of the water pump (3) is installed at the end of the pumping pipe (4) away from the water pipe connector (11). The output end of the water pump (3) is equipped with a water outlet pipe (5).

10. A foundation pit drainage facility for civil engineering construction according to claim 2, characterized in that, The length of the T-shaped slider (912) is less than the length of the T-shaped groove (922).

Images