Well sealing structure of dewatering well

Abstract

The utility model discloses a well sealing structure of a dewatering well. The well sealing structure comprises a steel pipe, a first water stop piece and a second water stop piece, the lower part of the steel pipe extends into the dewatering well; the first water stop piece and the second water stop piece are horizontally arranged at intervals from bottom to top in the axial direction of the steel pipe. The first water stop piece extends into a concrete cushion layer on the upper portion of the dewatering well, and the lower surfaces of the two ends of the first water stop piece make contact with the bottom of the foundation pit. The second water stop strip extends into a bottom plate at the upper part of the concrete cushion layer; the top of the steel pipe extends out of the bottom plate surface above the concrete cushion layer; and a water swelling sealing ring is arranged on the outer wall of the steel pipe below the second sealing strip. The well sealing structure has the advantages that the two layers of water stopping pieces and the water-swelling water stopping ring are arranged, water in a dewatering well is prevented from invading the bottom plate through the outer wall of the steel pipe of the well sealing structure, and the waterproof effect is greatly improved; the lower portion of the steel pipe is inserted into the upper portion of the dewatering well and exposed out of the bottom plate, connection between the well sealing structure and the dewatering well is guaranteed, and bottom plate concrete is prevented from falling into the dewatering well.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit dewatering technology, specifically to a dewatering well sealing structure. Background Technology

[0002] During the excavation of the foundation pit, dewatering wells should be evenly spaced throughout the pit to lower the groundwater level and meet the operational conditions for earthwork excavation and foundation construction. Dewatering wells should be installed in soil layers with confined groundwater to prevent foundation pit safety issues such as sudden surges, collapses, and support deformation during excavation.

[0003] After the foundation pit construction is completed, in accordance with specifications and design requirements, effective measures need to be taken to seal the dewatering wells to ensure the smooth progress of subsequent works. Currently, the conventional method for sealing wells is to first inject concrete into the dewatering well, and then fix the well cover to the wellhead by welding.

[0004] However, the well-sealing structure formed by the combination of the manhole cover and the concrete structure is rough, and the waterproofing joints are not meticulously designed, making it prone to leakage and affecting the construction quality of the foundation pit. Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a sealing structure for a dewatering well, addressing the shortcomings of existing technologies and aiming to improve the waterproofing effect.

[0006] The technical solution adopted in this utility model is: a well sealing structure for dewatering wells, including a steel pipe, a first water-stopping plate, and a second water-stopping plate;

[0007] The lower part of the steel pipe extends into the dewatering well;

[0008] The first and second waterstops are horizontally arranged and spaced apart from bottom to top along the axial direction of the steel pipe.

[0009] The first waterstop extends into the concrete cushion layer above the dewatering well, and the lower surfaces of both ends of the first waterstop are in contact with the bottom of the foundation pit.

[0010] The second waterstop extends into the bottom slab above the concrete cushion layer;

[0011] The top of the steel pipe extends beyond the surface of the bottom plate above the concrete cushion layer;

[0012] A water-swellable sealing ring is installed on the outer wall of the steel pipe below the second water-stop plate.

[0013] According to the above plan, a gap-filling layer is installed in the gap between the well wall of the dewatering well and the outer wall of the steel pipe.

[0014] According to the above scheme, waterproof mortar layers are filled in the gap between the lower surface of the first water-stopping sheet and the wellhead of the dewatering well, and in the gap between the lower surface of the first water-stopping sheet and the bottom of the foundation pit.

[0015] According to the above scheme, a waterproof reinforcement layer is set on the concrete cushion layer, and the inner end of the waterproof reinforcement layer extends upward along the outer wall of the steel pipe to the lower part of the water-swellable sealing ring.

[0016] According to the above scheme, a non-curing asphalt waterproof coating layer is applied to the top of the concrete cushion layer, and the inner end of the non-curing asphalt waterproof coating layer is turned up along the outer wall of the steel pipe to the lower part of the water-swellable sealing ring; the waterproof reinforcement layer is set on the non-curing asphalt waterproof coating layer.

[0017] According to the above scheme, a roll waterproofing layer is laid on the non-cured asphalt waterproofing coating layer on top of the concrete cushion layer. The inner end of the roll waterproofing layer extends upward along the surface of the waterproofing reinforcement layer and covers the waterproofing reinforcement layer.

[0018] According to the above scheme, a third water-stop plate with a reserved central hole is provided inside the steel pipe.

[0019] According to the above scheme, the third water-stop plate is horizontal, and its height is the same as that of the second water-stop plate.

[0020] According to the above scheme, the steel pipe is a hot-rolled seamless steel pipe.

[0021] According to the above scheme, both the first and second water-stop plates are steel plates, and they are fully welded to the outer wall of the steel pipe on both sides.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. The well sealing structure of this utility model is equipped with two layers of water-stop plates, and a water-swellable water-stop ring is set on the outer wall of the steel pipe between the two water-stop plates. This can effectively prevent water in the dewatering well from entering the bottom plate through the outer wall of the steel pipe of the well sealing structure, which greatly improves the waterproof effect. The lower part of the steel pipe of the well sealing structure is inserted into the dewatering well, and the upper part is exposed on the surface of the bottom plate. This design ensures a better connection between the well sealing structure and the dewatering well, and also prevents concrete from falling into the dewatering well during the pouring of the bottom plate.

[0024] 2. This utility model sets a gap-filling layer in the gap between the steel pipe of the well sealing structure and the well wall of the dewatering well, and sets a waterproof mortar layer on the bottom surface of the first water-stopping plate, which can effectively prevent water in the dewatering well from invading the well sealing structure; the second water-stopping plate is in contact with the bottom surface of the foundation pit, which increases the stability of the well sealing structure.

[0025] 3. In this utility model, a waterproof reinforcement layer is set on the outer wall of the steel pipe between the bottom of the water-swellable sealing ring and the concrete cushion layer, a non-curing asphalt coating is applied, and a waterproof membrane is laid. The combination of these three waterproofing methods greatly improves the external waterproofing performance of the well sealing structure.

[0026] 4. In this utility model, the bottom plate of the steel pipe outside the well sealing structure is roughened and filled with well-filling concrete, then coated with waterproof paint and waterproof mortar, ensuring the final waterproof effect of the well sealing structure. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0028] Figure 2 This is a top view of this embodiment.

[0029] Figure 3 This is a schematic diagram showing the earthwork excavation to the design elevation in this embodiment.

[0030] Figure 4 This is a schematic diagram of the well sealing structure installation and concrete cushion layer pouring in this embodiment.

[0031] Figure 5 This is a schematic diagram of the waterproofing construction in this embodiment.

[0032] Figure 6 This is a schematic diagram of the base plate casting process in this embodiment.

[0033] Figure 7 This is a schematic diagram of the welding of the third water-stop plate and the construction of the filling material in the dewatering well in this embodiment.

[0034] Figure 8 This is a schematic diagram of the surface layer construction in this embodiment.

[0035] Figure 9 for Figure 6 Enlarged view of point A.

[0036] The components are as follows: 1-Drainage well; 2-Foundation pit; 3-Concrete cushion layer; 4-Gap filling layer; 5-Waterproof mortar layer; 6-Sealing structure; 61-Steel pipe; 62-Weld; 63-First waterstop; 64-Third waterstop; 65-Second waterstop; 7-Edge finishing layer; 8-Water-swellable waterstop ring; 9-Waterproof reinforcement layer; 10-Non-curing asphalt waterproof coating layer; 11-Rolled waterproof membrane layer; 12-Base slab; 13-Waterproof micro-expansion concrete; 14-Clay ball; 15-Cement-based penetrating crystalline waterproof coating; 16-Waterproof mortar; 17-Fine stone concrete surface layer; 18-Wire mesh; 19-Roughened surface; 20-Cement grout. Detailed Implementation

[0037] To better understand this utility model, it will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 and Figure 2The diagram shows a sealing structure for a dewatering well, which includes a steel pipe 61, a first water-stopping plate 63, and a second water-stopping plate 65.

[0039] The lower part of the steel pipe 61 extends into the dewatering well 1;

[0040] The first waterstop plate 63 and the second waterstop plate 65 are horizontal and arranged at intervals from bottom to top along the axial direction of the steel pipe 61.

[0041] The first waterstop 63 extends into the concrete cushion layer 3 above the dewatering well 1. The lower surface of the inner side (the side closer to the steel pipe 1) of the first waterstop 63 contacts the wellhead of the dewatering well 1, and the lower surface of the outer side (the side away from the steel pipe 1) of the first waterstop 63 contacts the bottom of the foundation pit 2.

[0042] The second waterstop 65 extends into the bottom plate 12 above the concrete cushion layer 3;

[0043] The top of the steel pipe 61 extends beyond the surface of the base plate 12;

[0044] A water-swellable sealing ring 8 is installed on the outer wall of the steel pipe 61 below the second water-stop plate 65.

[0045] In this utility model, the steel pipe 61 is a hot-rolled seamless steel pipe; the first waterstop 63 and the second waterstop 65 are both steel plates, and both are fully welded to the outer wall of the steel pipe 61 on both sides, with the weld 62 as shown. Figure 1 and Figure 2 As shown; the water-swellable sealing ring 8 is disposed on the outer wall of the steel pipe 61 between the first sealing plate 63 and the second sealing plate 65. The inner bottom of the first sealing plate 63 is in contact with the wellhead of the dewatering well 1, and the outer bottom surface of the first sealing plate 63 is in contact with the bottom of the foundation pit 2.

[0046] Preferably, the steel pipe 61 has a third water-stop plate 64 with a reserved central hole inside; the third water-stop plate 64 is horizontal and its height is the same as that of the second water-stop plate 65. The third water-stop plate 64 plays a sealing role inside the dewatering well.

[0047] Preferably, a gap-filling layer 4 is provided in the gap between the well wall of the dewatering well 1 and the outer wall of the steel pipe 61.

[0048] In this invention, the gap-filling layer 4 is made of a mixture of hemp fibers and cement. By using hemp fibers and cement as the gap-filling layer 4 between the well sealing structure 6 and the dewatering well 1, the gap can be filled, preventing water from the dewatering well 1 from entering the well sealing structure 6.

[0049] Preferably, the gap between the lower surface of the first waterstop 63 and the wellhead of the dewatering well 1, and the gap between the lower surface of the first waterstop 63 and the bottom of the foundation pit 2 are respectively filled with a waterproof mortar layer 5 to ensure that the grout overflows from the outside of the first waterstop 63.

[0050] Preferably, a waterproof reinforcing layer 9 is provided on the concrete cushion layer 3, and the inner end of the waterproof reinforcing layer 9 (the end closest to the steel pipe 61) extends upward along the outer wall of the steel pipe 61 to the lower part of the water-swellable sealing ring 8.

[0051] In this utility model, the waterproof reinforcement layer 9 is in the form of waterproof coating + non-woven fabric or waterproof roll material, with a width of 500mm. The inner end of the waterproof reinforcement layer 9 is turned up along the outer wall of the steel pipe 61 to the lower part of the water-swellable sealing ring 8.

[0052] Preferably, a non-curing asphalt waterproof coating layer 10 is applied to the top of the concrete cushion layer 3, and the inner end of the non-curing asphalt waterproof coating layer 10 is turned up along the outer wall of the steel pipe 61 to the lower part of the water-swellable sealing ring 8; the waterproof reinforcement layer 9 is provided on the non-curing asphalt waterproof coating layer 10.

[0053] Preferably, a roll waterproofing layer 11 is laid on the non-cured asphalt waterproof coating layer 10 on top of the concrete cushion layer 3, and the inner end of the roll waterproofing layer 11 extends upward along the surface of the waterproof reinforcement layer 9 and covers the waterproof reinforcement layer 9.

[0054] like Figure 9 As shown, this utility model is provided with three layers of waterproof material, including a waterproof reinforcement layer 9, a non-curing asphalt waterproof coating layer 10, and a roll waterproof layer 11. All three layers of waterproof material are closed at the lower part of the water-swellable sealing ring 8, and a sealant is applied to the closed part.

[0055] Example

[0056] like Figure 1 and Figure 2 The diagram shows a sealing structure for a dewatering well, comprising a steel pipe 61, a first water-stop plate 63, a second water-stop plate 65, and a third water-stop plate 64. The lower part of the steel pipe 61 is inserted into the dewatering well 1, and the top of the steel pipe 61 extends beyond the surface of the base plate 12. The first water-stop plate 63 and the second water-stop plate 65 are both located outside the steel pipe 61. The first water-stop plate 63 extends into the concrete cushion layer 3 above the dewatering well 1. The second water-stop plate 65 extends into the base plate 12 above the concrete cushion layer 3. Below the second water-stop plate 65, the steel pipe 61... 1. A water-swellable sealing ring 8 is installed on the outer wall; a third sealing plate 64 with a reserved central hole is installed inside the steel pipe 61, and the height of the third sealing plate 64 is the same as the height of the second sealing plate 65; a roll waterproof layer 11 and a waterproof reinforcement layer 9 are installed on the concrete cushion layer 3, and the waterproof reinforcement layer 9 is installed on the roll waterproof layer 11; a non-curing asphalt waterproof coating layer 10 is applied to the roll waterproof layer 11 on the top of the concrete cushion layer 3, and the inner end of the non-curing asphalt waterproof coating layer 10 extends upward and covers the waterproof reinforcement layer 9.

[0057] In this embodiment, the steel pipe 61 has a wall thickness ≥ 3mm; the outer diameter of the steel pipe 61 is 20mm smaller than the inner diameter of the dewatering well 1; and the height of the steel pipe 61 is 200mm greater than the thickness of the base plate 12. The width of the first waterstop 63 and the second waterstop 65 are both 100mm to 200mm, and their thicknesses are ≥ 3mm. The two waterstops are respectively arranged 50mm above the bottom of the steel pipe 61 and (1 / 2 to 2 / 3 of the thickness of the base plate 12) + 150mm, that is, the waterstops are arranged at the bottom of the concrete cushion layer 3 and at 1 / 2 to 2 / 3 of the base plate 12. The steel pipe 61 is inserted into the dewatering well 150mm and protrudes 50mm from the top surface of the base plate 12.

[0058] The sealing structure described in this embodiment is used for the sealing of dewatering wells. The sealing structure 6 is installed inside the dewatering well 1. The surface of the base plate 12 is roughened. Then, filler concrete is constructed inside the dewatering well 1, inside the steel pipe 61, and in the roughened area. Cement-based penetrating crystalline waterproof coating 15 is applied to the surface of the filler concrete, followed by waterproof mortar 16 (the application area of ​​cement-based penetrating crystalline waterproof coating 15 and waterproof mortar 16 should completely cover the upper surface of the filler concrete). Finally, fine stone concrete surface layer 17 is constructed. The specific construction process is as follows:

[0059] The specific process is as follows:

[0060] (1) Excavate the earthwork to the bottom of foundation pit 2, remove and clean the dewatering well structure above the bottom of foundation pit 2, such as Figure 3 As shown. During the excavation process, attention should be paid to the protection of the finished filter pipe structure below the bottom of the foundation pit 2. The top surface of the dewatering well 1 and the bottom of the foundation pit 2 should be at the same level. The excavated structure should not be directly filled into the dewatering well 1 to avoid clogging of the dewatering well 1 and damage to the dewatering equipment. It should be transported to the designated construction waste storage location.

[0061] (2) Install well sealing structure 6, such as Figure 4 As shown. The steel pipe 61 of the sealing structure 6 is inserted into the dewatering well 1. The gap between the outer wall of the steel pipe 61 of the sealing structure 6 and the well wall of the dewatering well 1 is filled with hemp fiber and cement as a gap filling layer 4. The gap between the first water-stop plate 63 of the sealing structure 6 and the upper opening of the dewatering well 1 is filled with waterproof mortar (the waterproof mortar layer 5 can be applied before the installation of the sealing structure 6) to ensure that the grout overflows from the side of the water-stop ring after the sealing structure 6 is installed. The steel pipe 61 in the sealing structure 6 is inserted into the dewatering well 1 by 50mm and protrudes 50mm from the top surface of the bottom plate 12 to ensure a better connection between the sealing structure 6 and the dewatering well 1 and to ensure that concrete does not easily spill into the dewatering well 1 during the pouring of the bottom plate 1.

[0062] (3) Pour concrete foundation 3. Concrete foundation 3 is made of C20 concrete and has a thickness of 100mm. Figure 5As shown; after the concrete cushion layer 3 is cured to the set strength, the inside corner between the concrete cushion layer 3 and the steel pipe 61 of the well sealing structure 6 is rounded with fine stone concrete. The edge finishing layer 7 is waterproof material (including the waterproof reinforcement layer 9, the non-curing asphalt waterproof coating layer 10 and the waterproof membrane 11 mentioned later) turned up to the well wall to provide a working surface.

[0063] (4) Waterproofing material application, such as Figure 5 and Figure 9 As shown. Apply a non-curing asphalt waterproof coating layer 10, covering the upper surface of the concrete pad 3 and extending up along the edge layer 7 and the outer wall of the steel pipe to below the second waterstop 65; then add a waterproof reinforcement layer 9 (located on the non-curing asphalt waterproof coating layer 10) at the corner of the steel pipe 61 and the concrete pad 3 below the second waterstop 65 of the well sealing structure 6. The waterproof reinforcement layer 9 is made of waterproof coating + non-woven fabric or waterproof roll material (the waterproof roll material should be pre-cut to a suitable size according to the cylinder and wrapped, ensuring an overlap length with the steel pipe 61 ≥ 100mm), with a width of 500mm, extending up to below the second waterstop 65 of the well sealing structure 6; then construct the roll waterproof layer 11, covering the non-curing asphalt waterproof coating layer 10 on the concrete pad 3 and the waterproof reinforcement layer 9, as shown. Figure 9 As shown. Each waterproof material is sealed at the outer wall of the steel pipe 61 of the well sealing structure 6. A sealant is applied to the sealed area, and a water-swellable sealing ring 8 is installed above the sealant. The water-swellable sealing ring 8 can be pre-installed or a water-swellable sealing strip can be attached around the ring.

[0064] (5) Pouring of impermeable concrete for the base slab 12, such as Figures 6-8 As shown, after the impermeable concrete has been cured to the design strength, the area below the top surface of the base plate and within 50mm to 100mm of the outer contour of the steel pipe 61 is roughened and cleaned; excess steel pipe 61 of the well sealing structure 6 is removed, so that the upper end of the steel pipe 61 is lower than the roughened surface 19, and the steel pipe 61 and the roughened surface 19 form a self-waterproof structure to avoid leakage.

[0065] (6) Remove the dewatering equipment from dewatering well 1, and immediately place clay balls 14 into the bottom of dewatering well 1 for sealing. After sealing, lower wire mesh 18 into the dewatering well 1 (wire mesh 18 is located above clay balls 14); then weld the third water-stop plate 64 with a reserved center hole on one side inside the sealing structure 6 to ensure the weld is complete. Figure 7 As shown; the roughened surface 19 of the base plate 12 is moistened with water, cement grout 20 is used as the base, and waterproof micro-expansion concrete 13 (well filling concrete) of the same or higher grade is used to fill it until it is flush with the top surface of the base plate.

[0066] (7) After the waterproof micro-expansion concrete 13 reaches its design strength, apply cement-based penetrating crystalline waterproof coating 15 within a 100mm radius of the construction joint formed after the successive pouring, apply waterproof mortar 16, and finally pour the fine stone concrete surface layer 17, as follows. Figure 8 As shown.

[0067] In this embodiment, the pouring depth of clay ball 14 and waterproof micro-expansion concrete 13 should be comprehensively considered in conjunction with the dewatering situation of the foundation pit, and the well sealing time should be carried out in accordance with the design and construction plan requirements.

[0068] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0069] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the 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. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for a dewatering well, characterized in that, Includes steel pipe, first waterstop plate, and second waterstop plate; The lower part of the steel pipe extends into the dewatering well; The first and second waterstops are horizontally arranged and spaced apart from bottom to top along the axial direction of the steel pipe. The first waterstop extends into the concrete cushion layer above the dewatering well, and the lower surfaces of both ends of the first waterstop are in contact with the bottom of the foundation pit. The second waterstop extends into the bottom slab above the concrete cushion layer; The top of the steel pipe extends beyond the surface of the bottom plate above the concrete cushion layer; A water-swellable sealing ring is installed on the outer wall of the steel pipe below the second water-stop plate.

2. The well sealing structure for dewatering wells as described in claim 1, characterized in that, A gap-filling layer is installed in the gap between the well wall and the outer wall of the steel pipe.

3. The well sealing structure for dewatering wells as described in claim 1, characterized in that, Waterproof mortar layers are filled in the gap between the lower surface of the first waterstop and the wellhead of the dewatering well, and in the gap between the lower surface of the first waterstop and the bottom of the foundation pit.

4. The well sealing structure for dewatering wells as described in any one of claims 1 to 3, characterized in that, A waterproof reinforcement layer is installed on the concrete cushion layer, with the inner end of the waterproof reinforcement layer extending upward along the outer wall of the steel pipe to the lower part of the water-swellable sealing ring.

5. The well sealing structure for dewatering wells as described in claim 4, characterized in that, A non-curing asphalt waterproof coating layer is applied to the top of the concrete subbase. The inner end of the non-curing asphalt waterproof coating layer is turned up along the outer wall of the steel pipe to the lower part of the water-swellable sealing ring. The waterproof reinforcement layer is placed on the non-curing asphalt waterproof coating layer.

6. The well sealing structure for dewatering wells as described in claim 5, characterized in that, A roll waterproofing layer is laid on top of the non-curing asphalt waterproofing coating layer of the concrete subbase. The inner end of the roll waterproofing layer extends upward along the surface of the waterproofing reinforcement layer and covers the waterproofing reinforcement layer.

7. The well sealing structure for dewatering wells as described in claim 1, characterized in that, The steel pipe is equipped with a third water-stop plate with a reserved central hole inside.

8. The well sealing structure for dewatering wells as described in claim 7, characterized in that, The third waterstop is horizontal and its height is the same as that of the second waterstop.

9. The well sealing structure for dewatering wells as described in any one of claims 5 to 8, characterized in that, The steel pipe is a hot-rolled seamless steel pipe.

10. The well sealing structure for dewatering wells as described in claim 9, characterized in that, Both the first and second water-stop plates are steel plates, and they are fully welded to the outer wall of the steel pipe on both sides.

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