Sealing structure of drainage well

Abstract

The utility model relates to a sealing structure of a drainage well, which belongs to the technical field of drainage well construction and comprises a well casing, medium-coarse sand or graded sand is backfilled in the well casing, a plain concrete cushion is poured at the top of the well casing, and a first steel plate ring is embedded in the plain concrete cushion and positioned above the well casing. The utility model has the beneficial effects that through the use of the steel plate ring I, the purpose of blocking the underground water level for the first time can be realized, and the purpose of blocking the underground water level for multiple times can be realized by utilizing the water stop steel plate ring and the circular steel plate on the steel pipe; and the sealing performance between the water stop steel plate ring and the first steel plate ring can be improved through backfilling of medium-coarse sand or graded gravel, the overall stability is enhanced, a reliable post-sealing well construction method is provided under the condition that the underground water level cannot meet the dry groove operation and anti-floating requirements after water pumping of the drainage well within the foundation stopping range before foundation construction, and the construction cost is reduced. And underground water cannot flow into the foundation pit again.

Description

Technical Field

[0001] This utility model relates to the field of drainage well construction technology, and in particular to the sealing structure of drainage wells. Background Technology

[0002] In construction projects, especially during the construction of underground garage foundation pits, it is very important to manage groundwater reasonably and effectively. The traditional approach is to lower the groundwater level by setting up dewatering wells and dewatering wells after the foundation pit is excavated, so as to ensure the safety and efficiency of dry trench operations.

[0003] Provided that dry trenching operations are permitted, the dewatering wells and dewatering wells in the middle of the underground garage foundation pit can be gradually sealed during raft slab construction. The dewatering wells at the edge of the foundation pit can be dewatered only after the foundation pit backfilling, garage roof backfilling, and the main structure progress meets the anti-buoyancy requirements. If the groundwater level can meet the requirements for dry trenching operations and anti-buoyancy after dewatering the dewatering wells within the foundation area is stopped before foundation construction, the wells can be sealed using the ordinary well sealing method. If the ordinary well sealing method is used for all wells, the groundwater level will not meet the requirements for dry trenching operations and anti-buoyancy after dewatering the dewatering wells within the foundation area is stopped before foundation construction. Utility Model Content

[0004] In view of the above-mentioned problems existing in the prior art, the main purpose of this utility model is to provide a closed structure for drainage wells.

[0005] The technical solution of this utility model is as follows: a closed structure for a drainage well includes a well pipe, the inside of which is backfilled with medium-coarse sand or graded gravel, a plain concrete cushion layer is poured on top of the well pipe, a steel plate ring is pre-embedded inside the plain concrete cushion layer and above the well pipe, a structural raft slab is poured on top of the plain concrete cushion layer, a steel pipe is welded to the inner wall of the well pipe, a circular steel plate is fully welded at the opening of the medium-coarse sand or graded gravel, the circular steel plate is used to seal the well pipe, a water-stop steel plate ring is welded to the top of the steel pipe, and the water-stop steel plate ring is set inside the structural raft slab.

[0006] By adopting the above technical solution, a reliable method of post-sealing wells is provided in case the groundwater level cannot meet the requirements for dry trench operation and anti-buoyancy after the dewatering of the drainage wells within the foundation area is stopped before foundation construction. This ensures that groundwater will not flow into the foundation pit again, thereby guaranteeing construction quality and safety.

[0007] In a preferred embodiment, an annular support plate is welded to the bottom of the steel pipe, the annular support plate is installed on the upper surface of the plain concrete cushion layer, and the annular support plate is embedded inside the structural raft slab.

[0008] By adopting the above technical solution and using the ring support plate, the steel pipe and the water-stop steel plate ring can play an important supporting role.

[0009] In a preferred embodiment, a waterproof additional layer is provided around the perimeter of the well pipe, and the width of the waterproof additional layer is not less than 500 mm.

[0010] By adopting the above technical solution and using the additional waterproof layer, groundwater can be prevented from rising to the bottom of the water-stop steel plate ring. At the same time, the waterproofing should be done well with the sealing structure to prevent groundwater from seeping through the gap between the well pipe and the structural raft slab.

[0011] In a preferred embodiment, the structural raft slab has an internal mounting groove for use with a circular steel plate, and the circular steel plate is installed inside the mounting groove.

[0012] By adopting the above technical solution and setting up the installation groove, an installation site can be provided for the circular steel plate, thereby reducing the exposure of the circular steel plate.

[0013] In a preferred embodiment, both ends of the water-stop steel plate ring are secured with anchor rods, and the bottom ends of the anchor rods are inserted into the plain concrete pad layer.

[0014] By adopting the above technical solution and using anchor bolts, the connection strength between the water-stop steel plate ring, steel pipe, annular support plate and plain concrete pad can be strengthened.

[0015] In a preferred embodiment, the steel pipe has a diameter of 325 mm and a wall thickness of 10 mm.

[0016] By adopting the above technical solution and using steel pipes, the installation height of the water-stop steel plate ring can be increased.

[0017] In a preferred embodiment, the interior of the water-stop steel plate ring is provided with mounting holes for use with anchor rods, and the size of the mounting holes matches that of the anchor rods.

[0018] By adopting the above technical solution, it is easier for workers to connect the anchor rod to the water-stop steel plate ring.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0020] In this invention, the use of steel plate ring one can achieve the purpose of sealing the groundwater level for the first time. The water-stopping steel plate ring and circular steel plate on the steel pipe can achieve the purpose of sealing the groundwater level multiple times. The backfilling with medium and coarse sand or graded sand and gravel can improve the sealing performance between the water-stopping steel plate ring and steel plate ring one, and enhance the overall stability. If the groundwater level cannot meet the requirements of dry trench operation and anti-buoyancy after the dewatering wells within the foundation area are stopped before foundation construction, a reliable post-sealing well method is provided to ensure that groundwater will not flow into the foundation pit again, thereby ensuring construction quality and safety. Attached Figure Description

[0021] Figure 1 A schematic diagram of the well sealing method before sealing, which provides the sealing structure for the drainage well of this utility model;

[0022] Figure 2 A schematic diagram of the post-sealing method for providing the sealing structure of the drainage well for this utility model;

[0023] Figure 3 A schematic diagram of a conventional well sealing structure for providing a drainage well for this utility model.

[0024] Legend: 1. Well casing; 2. Medium-coarse sand or graded gravel; 3. Plain concrete cushion layer; 4. Structural raft slab; 5. Steel plate ring; 6. Annular support plate; 7. Steel pipe; 8. Water-stop steel plate ring; 9. Circular steel plate; 10. Installation groove; 11. Anchor bolt. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] Reference Figure 1-3The closed structure of the drainage well includes a well pipe 1, the inside of which is backfilled with medium-coarse sand or graded gravel 2, a plain concrete cushion layer 3 is poured on top of the well pipe 1, a steel plate ring 5 is pre-embedded inside the plain concrete cushion layer 3 and above the well pipe 1, a structural raft slab 4 is poured on top of the plain concrete cushion layer 3, a steel pipe 7 is welded to the inner wall of the well pipe 1, a circular steel plate 9 is fully welded at the opening of the medium-coarse sand or graded gravel 2, the circular steel plate 9 is used to seal the well pipe 1, a water-stop steel plate ring 8 is welded to the top of the steel pipe 7, the water-stop steel plate ring 8 is set inside the structural raft slab 4, and the steel plate ring 8 is made before the construction of the structural raft slab 4 cushion layer. Pipe 7, through the use of steel plate ring 5, can achieve the purpose of initial sealing of the groundwater level. The water-stopping steel plate ring 8 and circular steel plate 9 on steel pipe 7 can achieve the purpose of multiple sealing of the groundwater level. Furthermore, the backfilling of medium-coarse sand or graded sand and gravel 2 can improve the sealing performance between the water-stopping steel plate ring 8 and steel plate ring 5, and enhance the overall stability. In the case where the groundwater level cannot meet the requirements of dry trench operation and anti-buoyancy after the dewatering of the drainage well within the foundation area is stopped before foundation construction, a reliable post-sealing well method is provided to ensure that groundwater will not flow into the foundation pit again, thereby ensuring construction quality and safety.

[0027] Specifically, an annular support plate 6 is welded to the bottom of the steel pipe 7. The annular support plate 6 provides important support for the steel pipe 7 and the water-stop steel ring 8, and provides good stability for the installation of the water-stop steel ring 8. The annular support plate 6 is installed on the surface of the plain concrete cushion layer 3 and is embedded inside the structural raft slab 4. A waterproof additional layer is provided around the well pipe 1. The use of the waterproof additional layer can prevent groundwater from rising to the bottom of the water-stop steel ring 8. At the same time, the waterproof layer should have a good sealing structure to prevent groundwater from seeping through the gap between the well pipe 1 and the structural raft slab 4. The width of the waterproof additional layer is not less than 500 mm. The structural raft slab 4 has an installation groove 10 for use with the circular steel plate 9. The installation groove 10 provides an installation space for the circular steel plate 9 to reduce the exposure of the circular steel plate 9. The circular steel plate 9 is installed inside the installation groove 10.

[0028] Specifically, anchor rods 11 are snapped into both ends of the water-stop steel ring 8. The use of anchor rods 11 can strengthen the connection between the water-stop steel ring 8, steel pipe 7, annular support plate 6 and plain concrete pad 3, thereby improving the stability of the structure when used in the drainage well. The bottom ends of the anchor rods 11 are inserted into the interior of the plain concrete pad 3. The steel pipe 7 has a diameter of 325 mm and a wall thickness of 10 mm. The interior of the water-stop steel ring 8 is provided with mounting holes for use with the anchor rods 11. The mounting holes are designed to facilitate the connection of the anchor rods 11 to the water-stop steel ring 8 by the workers. The size of the mounting holes matches the anchor rods 11.

[0029] Working principle: If the groundwater level cannot meet the requirements for dry trench operation and anti-buoyancy after pumping out the dewatering wells within the foundation area before foundation construction, the well can be sealed using the post-sealing method. The specific method is as follows: First, before constructing the raft foundation 4, prepare the steel pipe 7 and weld a ring support plate 6 to the outside of the steel pipe 7, with the ring support plate 6 facing the plain concrete foundation 3. Install the steel pipe 7 during foundation foundation construction, and clean the surface of the steel pipe 7 before waterproofing. Make a waterproof additional layer of not less than 500 mm wide around the casing, and use the waterproof additional layer to... This method prevents groundwater from overflowing to the bottom of the water-stop steel ring 8. At the same time, waterproofing requires proper sealing of the edges to prevent groundwater from seeping through the gap between the well pipe 1 and the structural raft 4. After the structural raft 4 is poured and meets the structural anti-buoyancy requirements, the drainage well is sealed. Then, medium-coarse sand or graded gravel 2 is backfilled and measures are taken to compact the filler to 2m below the structural raft 4. Then, a water-stop steel ring 8 is welded inside the steel pipe 7 and concrete is poured to the opening of the well pipe 1. Then, a circular steel plate 9 is fully welded to the opening of the well pipe 1 to seal it. Finally, concrete is poured to the top elevation of the raft slab.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A closure structure for a dewatering well comprising a well pipe (1), characterized in that: The inside of the well pipe (1) is backfilled with medium-coarse sand or graded sandstone (2), the top of the well pipe (1) is poured with a concrete cushion (3), a steel plate ring one (5) is pre-buried in the inside of the concrete cushion (3) and above the well pipe (1), a structural raft (4) is poured at the top end of the concrete cushion (3), a steel pipe (7) is welded on the inner wall of the well pipe (1), a circular steel plate (9) is full-welded at the pipe opening of the medium-coarse sand or graded sandstone (2), the circular steel plate (9) is used for sealing the well pipe (1), a water-stop steel plate ring (8) is welded at the top of the steel pipe (7), and the water-stop steel plate ring (8) is arranged in the inside of the structural raft (4).

2. A closure structure for a dewatering well according to claim 1, wherein: The bottom of the steel pipe (7) is welded with an annular supporting plate (6), the annular supporting plate (6) is installed on the upper surface of the concrete cushion (3), and the annular supporting plate (6) is pre-buried in the inside of the structural raft (4).

3. A closure structure for a dewatering well according to claim 1, wherein: A waterproof additional layer is arranged at the circumference of the well pipe (1), and the width of the waterproof additional layer is not less than 500 mm.

4. The closure structure for a dewatering well according to claim 1, wherein: An installation groove (10) is arranged in the inside of the structural raft (4) and used in cooperation with the circular steel plate (9), and the circular steel plate (9) is installed in the inside of the installation groove (10).

5. The closure structure for a dewatering well according to claim 1, wherein: Anchor rods (11) are clamped at both ends of the water-stop steel plate ring (8), and the bottom ends of the anchor rods (11) are inserted into the inside of the concrete cushion (3).

6. The closure structure for a dewatering well of claim 1, wherein: The size of the steel pipe (7) is 325 mm in diameter, and the wall thickness of the steel pipe (7) is 10 mm.

7. The closure structure for a dewatering well according to claim 1, wherein: An installation hole is formed in the inside of the water-stop steel plate ring (8) and used in cooperation with the anchor rod (11), and the size of the installation hole is matched with the anchor rod (11).

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