Foundation raft anti-floating dewatering well water stop assembly

Abstract

The utility model relates to a foundation raft anti-floating dewatering well water stop assembly which comprises a water pump and further comprises a water stop mechanism, and a plurality of water inlet holes are annularly formed in the lower portion of the water stop mechanism in a penetrating mode. The built-in filter screen is connected to the lower part in the water stop mechanism and is positioned above the uppermost row of water inlet holes; the water inlet filter valve is mounted in the water stop mechanism in a sliding manner; wherein the water pump is located in the water stop mechanism and arranged above the water inlet filter valve, and the water pump and the water inlet filter valve are matched with each other to complete the work that the water inlet filter valve automatically opens water inlet and closes water inlet. The device is simple in structure, high in practicability and capable of saving time and labor, reducing the construction cost and improving the construction efficiency; and meanwhile, the quality problem caused by segregation of concrete due to much water can be prevented, secondary drilling, glue injection and sealing are not needed, and the stability of construction quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to a water-stop component, in particular to a foundation raft anti-floating dewatering well water-stop component, belonging to the technical field of foundation pit dewatering well construction. Background Art

[0002] Generally speaking, it is necessary to set up precipitation wells in the foundation pit of a building construction project. Because during the excavation of the foundation pit, groundwater will continuously seep into the pit from the surrounding area of the foundation pit. The precipitation wells can collect groundwater to achieve precipitation in the foundation pit, ensuring that the foundation pit is constructed under dry conditions, thereby preventing quality problems such as instability of the foundation pit slope.

[0003] Normally, during the construction of the foundation raft, a certain number of dewatering wells will be set up around the foundation pit on the outside of the raft to ensure anti-floating requirements. When the raft area is relatively large, if only dewatering wells are set up on the outside of the raft, it may not meet the dewatering requirements. During the construction of the raft, the basement may not be pumped out in time, resulting in quality problems such as cracking of the raft or damage to the waterproof layer.

[0004] After searching, the Chinese utility model patent with patent announcement number CN219118205U discloses a water-stop sleeve for sealing a raft foundation dewatering well, comprising a steel pipe main body, which is vertically inserted into the dewatering well, and the outer diameter of the steel pipe main body is 100 mm smaller than the width of the dewatering well. The outer wall of the steel pipe main body is provided with a first water-stop ring and a second water-stop ring, the first water-stop ring is located in the middle of the steel pipe main body, the width of the first water-stop ring is not less than 100 mm, the second water-stop ring is located below the first water-stop ring, and the inner wall of the steel pipe main body is provided with a third water-stop ring, the third water-stop ring and the first water-stop ring are located at the same height and the width of the third water-stop ring is smaller than the width of the first water-stop ring. Although the water-stop sleeve of the above-mentioned design structure is provided with a first water-stop ring and a second water-stop ring on the outside of the steel pipe body, thereby adding a water-stop guarantee at the cushion layer, and a third water-stop ring is added to the inner wall of the steel pipe body, thereby adding a water-stop guarantee on the inside of the pipe, thereby enhancing the sealing and water-stopping effect of the water-stop sleeve and ensuring the quality of the foundation pit bottom plate, the patent still has the following disadvantages:

[0005] On the one hand, the technical problem is that the lower end of the water-stop sleeve recorded in the patent is not closed. The water-stop sleeve is inserted into the soil below the raft. During precipitation, a large amount of mud and sand will flow in. These mud and sand will enter the water pump and block the pumping pipe. It takes a lot of manpower and material costs to clean the mud and sand. The mud and sand will cause more serious wear and tear on the water pump that works for a long time. After a period of time, the water pump will be damaged.

[0006] On the other hand, there are also technical problems: after the foundation pit construction is completed, the concrete poured in the dewatering well needs to be sealed. If there is still mud and water in the dewatering well or water is still seeping around it, the unsolidified concrete poured into the well will seep out, causing the concrete in the well to segregate due to excessive water. When the concrete is formed, it will crack and leak water, requiring secondary drilling and glue injection to seal it, resulting in a large waste of time, cost and resources, which is not conducive to the normal progress of the construction period.

[0007] Based on this, the key to solving the above technical problems is to develop an improved foundation raft anti-floating precipitation well water stop pipe with simple structure, convenient operation and no need for secondary drilling and glue injection. Summary of the Invention

[0008] In view of the many defects and shortcomings in the above-mentioned background technology, the present invention has made improvements and innovations thereto, with the aim of providing a basic raft anti-floating precipitation well water-stop assembly with a simple structure and strong practicality. An inlet filter valve is placed inside the water-stop mechanism, and the water inlet filter valve can be opened and closed by utilizing the deadweight of the water pump. At the same time, the lower part of the water-stop mechanism can filter the silt, reduce the silt content in the muddy water, and reduce the blockage and wear of the water pump by the silt, thereby saving a lot of manpower, material resources and time costs, ensuring the normal progress of the construction period, and improving construction efficiency.

[0009] Another purpose of this invention is that when the drainage well is closed later, only the water pump needs to be removed to pour concrete into the drainage well. The water inlet filter valve remains in the drainage well to isolate the concrete from the remaining mud and water in the well, thereby preventing the quality problems caused by the segregation of concrete due to excessive water. There is no need for secondary drilling and glue injection to ensure the stability of construction quality. To solve the above problems and achieve the above invention purposes, this utility model is a foundation raft anti-floating drainage well water-stop assembly that adopts the following design structure and the following technical solutions:

[0010] A foundation raft anti-floating dewatering well water-stop assembly comprises a water pump (1) and further comprises:

[0011] A water-stop mechanism (2), wherein a plurality of water inlet holes (26) are formed in a circumferential direction through the lower portion of the water-stop mechanism (2);

[0012] Built-in filter (3), the built-in filter (3) is connected to the lower part of the water stop mechanism (2) and is located above the uppermost row of water inlet holes (26); the water inlet filter valve (4), the water inlet

[0013] The filter valve (4) is slidably mounted inside the water stop mechanism (2);

[0014] The water pump (1) is located inside the water stop mechanism (2), and the water pump (1) is arranged above the water inlet filter valve (4). The water pump (1) and the water inlet filter valve (4) cooperate with each other to complete the work of automatically opening and closing the water inlet of the water inlet filter valve (4).

[0015] Preferably, the water-stop mechanism (2) comprises a water-stop pipe body (21), which is a tubular body with openings at both ends, and a plurality of circular water inlet holes (26) are evenly arranged at the lower part of the water-stop pipe body (21).

[0016] Preferably, the water-stopping mechanism (2) further comprises:

[0017] a first water stop ring (22), the first water stop ring (22) being welded to the outer wall surface of the upper end of the water stop pipe body (21);

[0018] a second water stop ring (23), the second water stop ring (23) being welded to the outer wall surface of the water stop pipe body (21) below the first water stop ring (22);

[0019] The first water stop ring (22) and the second water stop ring (23) have the same width.

[0020] Preferably, the water stop mechanism (2) further comprises a third water stop ring (24), the third water stop ring (24) is welded to the inside of the water stop pipe body (21), and the third water stop ring (24) and the first water stop ring (22) are located at the same height.

[0021] Preferably, the water-stop mechanism (2) further comprises an external filter screen (25), the external filter screen (25) being wrapped around the water-stop pipe body (21) connected to the plurality of water inlet holes (26), the height of the external filter screen (25) being slightly greater than the overall height of the plurality of water inlet holes (26), wherein the external filter screen (25) is used to achieve the effect of preliminarily filtering out sediment.

[0022] Preferably, the water inlet filter valve (4) comprises:

[0023] A valve seat (41) is provided with a valve seat installation opening at the middle of the top end of the valve seat (41);

[0024] An installation sleeve (42), wherein the lower end of the installation sleeve (42) is connected to the valve seat installation opening;

[0025] A valve core (43) is slidably connected to the valve seat (41);

[0026] A top cover (44) is slidably sleeved on an upper portion of the mounting sleeve (42); a spring (45) is sleeved in the mounting sleeve (42);

[0027] The upper portion of the valve core (43) passes through the spring (45) and is connected to the top cover (44).

[0028] Preferably, the valve seat (41) as a whole is a cylindrical structure with openings at both ends and a hollow interior, and the valve seat mounting opening at the upper end of the valve seat (41) is much smaller than the opening at the lower end of the valve seat (41), wherein the upper end surface of the valve seat (41) is also provided with a plurality of water outlet holes (411) circumferentially extending around the valve seat mounting opening.

[0029] Preferably, the mounting sleeve (42) is a tubular structure with both ends open and the interior hollow, and the upper end opening of the mounting sleeve (42) is larger than the lower end opening of the mounting sleeve (42); the valve core (43) includes:

[0030] The valve cover (431) is a circular plate-shaped member as a whole, and the valve cover (431) is slidably connected to the inner wall of the valve seat (41);

[0031] A valve stem (432), one end of which is connected to the center of one end surface of the valve cover (431);

[0032] The threaded rod (433) is connected to the middle of the other end of the valve stem (432); wherein the diameter of the valve stem (432) is larger than the diameter of the threaded rod, and the diameter of the valve stem (432) is slightly smaller than the diameter of the valve seat installation opening.

[0033] Preferably, the top cover (44) comprises: a top cover (441), an internal thread section adapted to the threaded rod (433) is provided in the middle of the top cover (441), the top cover (441) is threadedly connected to the threaded rod (433), and the top cover (441) is used to support the placement of the water pump (1);

[0034] A connecting sleeve (442), wherein the upper end of the connecting sleeve (442) is connected to the lower portion of the top cover (441), and the lower portion of the connecting sleeve (442) is slidably connected to the inside of the mounting sleeve (42); the outer diameter of the connecting sleeve (442) is smaller than the outer diameter of the top cover (441), and the outer diameter of the connecting sleeve (442) is slightly smaller than the inner diameter of the mounting sleeve (42);

[0035] The upper end of the spring (45) is connected to the top cover (441), and the lower end of the spring (45) is connected to the lower open end surface of the mounting sleeve (42).

[0036] The working principle is as follows: when in use, the operator first places the water inlet filter valve (4) inside the water stop mechanism (2), and then places the water pump (1) vertically on the top cover (441) at the top of the water inlet filter valve (4), and uses the deadweight of the water pump (1) to compress the spring (45) provided inside to realize the opening of the water inlet filter valve (4); when the water pump (1) is working, the water inlet filter valve (4) can automatically drop under the pressure of the water pump (1) as the muddy water level inside the water stop mechanism (2) changes, thereby completely pumping out the muddy water inside the water stop mechanism (2); when the water pump (1) is working, the water inlet filter valve (4) can automatically drop under the pressure of the water pump (1) as the muddy water level inside the water stop mechanism (2) changes, thereby completely pumping out the muddy water inside the water stop mechanism (2); when the water stop mechanism (2) is closed ...) When the water mechanism (2) needs to be sealed by pouring concrete in the later stage, the water pump (1) only needs to be lifted upwards, and the spring (45) of the water inlet filter valve (4) will automatically reset when it loses pressure. Under the elastic action of the spring (45), the top cover (441) is pushed upwards to move upwards, and then the top cover (441) drives the valve stem (432) to pull the valve cover (431) upwards, thereby driving the valve cover (431) back to the cavity of the valve seat (41). At this time, the water inlet filter valve (4) is in a closed state, and the muddy water below the water inlet filter valve (4) is cut off.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. The water inlet (26) at the lower end of the water stop mechanism (2) of the utility model is wrapped with an external filter screen, and the upper part of the internal water inlet (26) is welded with a built-in filter screen. Through multiple filtrations of the multi-layer filter screen, large particles of sediment in the muddy water are effectively filtered, thereby reducing the wear of the water pump and the blockage of the pumping pipe by large particles of sediment, reducing the number of maintenance and cleaning times of the water pump and extending the service life of the water pump, thus avoiding delays in the construction period;

[0039] 2. The water inlet filter valve designed by this utility model remains in a closed state when it is located alone inside the water stop mechanism. When water needs to be pumped out, the water pump only needs to be placed vertically on the top of the water inlet filter valve, that is, the water inlet function is opened by the deadweight pressure of the water pump. When the water is pumped out, the water pump only needs to be lifted up, and the water inlet filter valve will automatically return to the closed state. The opening and closing operations of the water inlet filter valve are simple and can be completed by one person without the support of other staff or other equipment.

[0040] 3. The water inlet filter valve designed by this utility model is retained inside the water stop mechanism when the water stop mechanism is sealed for pouring concrete in the later stage of the project. This can isolate the concrete from the muddy water remaining inside the water stop mechanism, thereby avoiding direct contact between the concrete and the muddy water, preventing the concrete from segregating due to excess moisture, ensuring the quality of the project, and eliminating the quality problem of secondary drilling and glue injection after the concrete solidifies, thus ensuring the stability of the construction quality.

[0041] 4. The utility model has a simple structure and strong practicality. A water inlet filter valve is placed inside the water-stop mechanism, and the weight of the water pump can be used to control the opening and closing of the water inlet filter valve. At the same time, the lower part of the water-stop mechanism can filter the sediment, reduce the sediment content in the muddy water, and reduce the blockage and wear of the water pump by the sediment, thereby saving a lot of manpower, material resources and time costs, ensuring the normal progress of the construction period, and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0043] Figure 1 This is one of the usage state diagrams of the utility model;

[0044] Figure 2 This is the second diagram of the use state of the utility model;

[0045] Figure 3 This is the third diagram of the use state of the utility model;

[0046] Figure 4 This is the fourth diagram of the use state of the utility model;

[0047] Figure 5 This is one of the usage state diagrams of the water inlet filter valve (4) component of the utility model;

[0048] Figure 6 This is the second diagram of the use state of the water inlet filter valve (4) component of the utility model;

[0049] Figure 7 This is a schematic diagram of the overall structure of the components of the water-stop mechanism (2) of the utility model;

[0050] Figure 8 This is a front view of the components of the water-stop mechanism (2) of the utility model;

[0051] Figure 9 yes Figure 8 A cross-sectional view in the AA direction is shown;

[0052] Figure 10 It is a partial cross-sectional view of the utility model;

[0053] Figure 11 This is a schematic diagram of the overall structure of the water inlet filter valve (4) of the utility model;

[0054] Figure 12 It is a cross-sectional view of the water inlet filter valve (4) component of the utility model;

[0055] Figure 13 This is an exploded view of the water inlet filter valve (4) component of the utility model;

[0056] Among them, the numbers in the figure are: 1 - water pump;

[0057] 2 - water stop mechanism, 21 - water stop pipe body, 22 - first water stop ring, 23 - second water stop ring, 24 - third water stop ring, 25 - external filter screen, 26 - water inlet;

[0058] 3—Built-in filter,

[0059] 4—water inlet filter valve, 41—valve seat, 411—water outlet, 42—installation sleeve, 43—valve core, 431—valve cover, 432—valve stem, 433—threaded rod, 44—top cover, 441—top cover, 442—connecting sleeve, 45—spring;

[0060] 5—raft;

[0061] 6—Cushion layer. DETAILED DESCRIPTION

[0062] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other unless there is a conflict. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] like Figures 1 to 13 As shown, a foundation raft anti-floating precipitation well water-stop assembly includes a water pump 1 and further includes:

[0064] The water stop mechanism 2 has a plurality of water inlet holes 26 formed in a circular pattern at the lower portion of the water stop mechanism 2;

[0065] The built-in filter 3 is connected to the lower part of the water stop mechanism 2 and is located above the uppermost row of water inlet holes 26;

[0066] The water inlet filter valve 4 is slidably mounted inside the water stop mechanism 2;

[0067] Among them, the water pump 1 is located inside the water stop mechanism 2, and the water pump 1 is set above the water inlet filter valve 4. The water pump 1 and the water inlet filter valve 4 cooperate with each other to complete the work of the water inlet filter valve 4 automatically opening and closing the water inlet.

[0068] In the present invention, the built-in filter screen 3 is used to further filter the sediment.

[0069] Further, such as Figure 10 As shown, the water stop mechanism 2 includes a water stop pipe body 21 . The water stop pipe body 21 is a tubular body with both upper and lower ends opened. A plurality of circular water inlet holes 26 are evenly opened at the lower part of the water stop pipe body 21 .

[0070] In the present invention, a filter screen is installed at the lower end opening of the water stop pipe body 21 . The filter screen and the external filter screen 25 are integrally formed or are in a split structure and sleeved on the lower end opening of the water stop pipe body 21 .

[0071] Further, such as Figures 7 to 10 As shown, the water-stopping mechanism 2 further includes:

[0072] A first water stop ring 22 is welded to the outer wall of the upper end of the water stop pipe body 21; a second water stop ring 23 is welded to the outer wall of the water stop pipe body 21 below the first water stop ring 22;

[0073] The first water-stop ring 22 and the second water-stop ring 23 have the same width.

[0074] Further, such as Figure 10 As shown, the water-stop mechanism 2 further includes a third water-stop ring 24 , which is welded to the inside of the water-stop pipe body 21 , and the third water-stop ring 24 and the first water-stop ring 22 are located at the same height.

[0075] Specifically, such as Figure 9 As shown, the water-stop mechanism 2 also includes an external filter screen 25, which is wrapped around the water-stop pipe body 21 connected to multiple water inlet holes 26. The height of the external filter screen 25 is slightly larger than the overall height of the multiple water inlet holes 26, wherein the external filter screen 25 is used to achieve the function of preliminary filtering of sediment.

[0076] Further, such as Figures 11 to 13 As shown, the water inlet filter valve 4 includes:

[0077] The valve seat 41 has a valve seat installation opening formed in the middle of the top of the valve seat 41;

[0078] The mounting sleeve 42 is connected to the valve seat mounting opening at its lower end;

[0079] The valve core 43 is slidably connected to the valve seat 41;

[0080] A top cover 44 is slidably sleeved on an upper portion of the mounting sleeve 42;

[0081] Spring 45, spring 45 is sleeved in the mounting sleeve 42;

[0082] The upper portion of the valve core 43 is connected to the top cover 44 through the spring 45 .

[0083] Specifically, such as Figure 13As shown, the valve seat 41 is a cylindrical structure with openings at both ends and a hollow interior, and the valve seat mounting opening at the upper end of the valve seat 41 is much smaller than the opening at the lower end of the valve seat 41. The upper end surface of the valve seat 41 is also provided with a plurality of water outlet holes 411 circumferentially extending around the valve seat mounting opening.

[0084] Specifically, such as Figure 13 As shown, the mounting sleeve 42 is a tubular structure with both ends open and the interior hollow, and the upper end opening of the mounting sleeve 42 is larger than the lower end opening of the mounting sleeve 42; the valve core 43 includes:

[0085] The valve cover 431 is a circular plate-shaped member and is slidably connected to the inner wall of the valve seat 41;

[0086] A valve stem 432, one end of which is connected to the center of one end surface of the valve cover 431;

[0087] A threaded rod 433 connected to the middle portion of the other end of the valve stem 432;

[0088] The diameter of the valve stem 432 is larger than the diameter of the threaded rod, and the diameter of the valve stem 432 is slightly smaller than the diameter of the valve seat installation opening.

[0089] In the present invention, the diameter of the valve cover 431 is the same as the inner diameter of the opening at the lower end of the valve seat 41 .

[0090] Specifically, such as Figure 13 As shown, the top cover 44 includes: a top cover 441, an internal thread section adapted to the threaded rod 433 is opened in the middle of the top cover 441, the top cover 441 is threadedly connected to the threaded rod 433, and the top cover 441 is used to support the placement of the water pump 1;

[0091] The connecting sleeve 442 has an upper end connected to the lower part of the top cover 441, and a lower part of the connecting sleeve 442 is slidably connected to the mounting sleeve 42; the outer diameter of the connecting sleeve 442 is smaller than the outer diameter of the top cover 441, and the outer diameter of the connecting sleeve 442 is slightly smaller than the inner diameter of the mounting sleeve 42; the spring 45 has an upper end connected to the top cover 441, and a lower end connected to the lower open end surface of the mounting sleeve 42.

[0092] In the present invention, the spring 45 is sleeved in the mounting sleeve 42 and the connecting sleeve 442 .

[0093] Furthermore, a support ring for placing the water inlet filter valve 4 is provided inside the water stop pipe body 21 , wherein the inner diameter of the support ring is larger than the diameter of the valve cover 431 .

[0094] In the present invention, the support ring is arranged above the built-in filter 3 .

[0095] In summary, the more specific implementation methods of the present invention are:

[0096] Before using the above-mentioned basic raft anti-floating precipitation well water-stop assembly, it is necessary to manufacture and install it as a backup.

[0097] The specific steps are:

[0098] During use, the operator first inserts the water-stop mechanism 2 through the raft 5 and the cushion layer 6 in sequence and then into the designated precipitation well. The bottom end of the water-stop pipe body 21 is not sealed and a plurality of water inlet holes 26 are provided at the lower part. Groundwater can penetrate into the water-stop mechanism 2 from multiple directions. The external filter 25 wrapped around the water inlet holes 26 can effectively prevent large pieces of mud and sand from following the groundwater flow into the water-stop mechanism 2. At the same time, the built-in filter 3 further filters out large pieces of mud and sand from the muddy water inside the water-stop mechanism 2, thereby reducing the wear of the mud and sand on the water pump 1.

[0099] The operator slides the water inlet filter valve 4 into the water stop mechanism 2, and then places the water pump 1 vertically on the top cover 441 at the top of the water inlet filter valve 4. When the weight of the water pump 1 acts on the top cover 441, the top cover 441 pushes the valve stem 432 downward to slide and compresses the spring 45, thereby driving the valve cover 431 to slide downward and separate from the cavity of the valve seat 41. At this time, the water inlet filter valve 4 is in the open state, and the muddy water below the water inlet filter valve 4 can enter the cavity of the valve seat 41 and enter the top of the water inlet filter valve 4 through several water outlet holes 411. The water pump 1 is started to pump out the muddy water. The water inlet filter valve 4 can automatically drop under the pressure of the water pump 1 as the muddy water level inside the water stop mechanism 2 changes, thereby completely pumping out the muddy water inside the water stop mechanism 2.

[0100] When the water-stop mechanism 2 needs to be sealed by pouring concrete in the later stage, it is only necessary to lift the water pump 1 upwards, and the spring 45 of the water inlet filter valve 4 will automatically reset when it loses pressure. Under the elastic action of the spring 45, the top cover 441 is pushed upward, and then the top cover 441 drives the valve stem 432 to pull the valve cover 431 upward, thereby driving the valve cover 431 back to the cavity of the valve seat 41. At this time, the water inlet filter valve 4 is in a closed state, and the muddy water below the water inlet filter valve 4 is cut off.

[0101] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any other limitation to the present invention. Any person skilled in the art may utilize the above-disclosed technical content to modify or remodel the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention shall still fall within the scope of protection of the present invention.

Claims

1. A foundation raft anti-floating dewatering well water-stop assembly, comprising a water pump (1), characterized in that: Also includes: A water-stop mechanism (2), wherein a plurality of water inlet holes (26) are formed in a circumferential direction through the lower portion of the water-stop mechanism (2); and a built-in filter (3), wherein the built-in filter (3) is connected to the lower portion of the water-stop mechanism (2) and is located above the uppermost row of water inlet holes (26); The water inlet filter valve (4) is slidably mounted inside the water stop mechanism (2); wherein the water pump (1) is located inside the water stop mechanism (2), and the water pump (1) is arranged above the water inlet filter valve (4); the water pump (1) and the water inlet filter valve (4) cooperate with each other to complete the work of automatically opening and closing the water inlet of the water inlet filter valve (4).

2. A foundation raft anti-floating dewatering well water-stop assembly according to claim 1, characterized in that: The water-stopping mechanism (2) comprises a water-stopping pipe body (21), which is a tubular body with openings at both ends. A plurality of circular water inlet holes (26) are evenly arranged at the lower portion of the water-stopping pipe body (21).

3. A foundation raft anti-floating dewatering well water-stop assembly according to claim 1 or 2, characterized in that: The water-stopping mechanism (2) further comprises: a first water stop ring (22), the first water stop ring (22) being welded to the outer wall surface of the upper end of the water stop pipe body (21); a second water stop ring (23), the second water stop ring (23) being welded to the outer wall surface of the water stop pipe body (21) below the first water stop ring (22); The first water stop ring (22) and the second water stop ring (23) have the same width.

4. A foundation raft anti-floating dewatering well water-stop assembly according to claim 1 or 2, characterized in that: The water-stop mechanism (2) further comprises a third water-stop ring (24), which is welded to the inside of the water-stop pipe body (21), and the third water-stop ring (24) and the first water-stop ring (22) are located at the same height.

5. A foundation raft anti-floating dewatering well water-stop assembly according to claim 1 or 2, characterized in that: The water-stop mechanism (2) further comprises an external filter screen (25), the external filter screen (25) being wrapped around the water-stop pipe body (21) connected to the plurality of water inlet holes (26), the height of the external filter screen (25) being slightly greater than the overall height of the plurality of water inlet holes (26), wherein the external filter screen (25) is used to achieve the function of preliminarily filtering sediment.

6. The anti-floating water-stop assembly for a foundation raft according to claim 1, characterized in that: The water inlet filter valve (4) comprises: A valve seat (41), wherein a valve seat installation opening is provided in the middle of the top of the valve seat (41); a mounting sleeve (42), wherein the lower end of the mounting sleeve (42) is connected to the valve seat installation opening; and a valve core (43), wherein the valve core (43) is slidably connected to the valve seat (41); A top cover (44) is slidably sleeved on an upper portion of the mounting sleeve (42); a spring (45) is sleeved in the mounting sleeve (42); The upper portion of the valve core (43) passes through the spring (45) and is connected to the top cover (44).

7. A foundation raft anti-floating dewatering well water-stop assembly according to claim 6, characterized in that: The valve seat (41) is a cylindrical structure with two ends open and an interior hollow, and the valve seat installation opening at the upper end of the valve seat (41) is much smaller than the opening at the lower end of the valve seat (41). The upper end surface of the valve seat (41) is also provided with a plurality of water outlet holes (411) extending in a circular direction around the valve seat installation opening.

8. The anti-floating water-stop assembly for a foundation raft as claimed in claim 6, characterized in that: The mounting sleeve (42) is in the form of a tubular structure with both ends open and the interior hollow, and the upper opening of the mounting sleeve (42) is larger than the lower opening of the mounting sleeve (42); The valve core (43) comprises: The valve cover (431) is a circular plate-shaped member as a whole, and the valve cover (431) is slidably connected to the inner wall of the valve seat (41); A valve stem (432), one end of which is connected to the center of one end surface of the valve cover (431); The threaded rod (433) is connected to the middle of the other end of the valve stem (432); wherein the diameter of the valve stem (432) is larger than the diameter of the threaded rod, and the diameter of the valve stem (432) is slightly smaller than the diameter of the valve seat installation opening.

9. The anti-floating water-stop assembly for a foundation raft as claimed in claim 6, characterized in that: The top cover (44) comprises: a top cover (441), wherein an internal thread section adapted to the threaded rod (433) is provided in the middle of the top cover (441), the top cover (441) is threadedly connected to the threaded rod (433), and the top cover (441) is used to support the placement of the water pump (1); a connecting sleeve (442), wherein the upper end of the connecting sleeve (442) is connected to the lower part of the top cover (441), and the lower part of the connecting sleeve (442) is slidably connected to the installation sleeve (42); the outer diameter of the connecting sleeve (442) is smaller than the outer diameter of the top cover (441), and the outer diameter of the connecting sleeve (442) is slightly smaller than the inner diameter of the installation sleeve (42); The upper end of the spring (45) is connected to the top cover (441), and the lower end of the spring (45) is connected to the lower open end surface of the mounting sleeve (42).

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