A precipitation well closure device

Abstract

The utility model discloses a kind of precipitation well closure devices, comprising: the positioning support cylinder body embedded in the wellhead of precipitation well and the closure cover plate located at the top of positioning support cylinder body;The discontinuous clamping block formed by the outside convex of the contact of positioning support cylinder body and closure cover plate and the discontinuous clamping groove formed by inward recessing;Gap is set between adjacent two clamping blocks or clamping grooves, and the arc length of gap is greater than the arc length of unit clamping block or clamping groove, the shape of clamping block and clamping groove is complementary, and the detachable connection of positioning support cylinder body and the closure cover plate is realized by rotating.This application provides a kind of precipitation well closure device with fast closure and high airtightness.Rapid installation is realized by the rotating locking design of convex and clamping groove;Effectively solve the defects of many construction procedures, complex process and long time of existing precipitation well closure, significantly improve waterproof reliability in combination with water stop ring and double sealing structure (mechanical seal+grouting seal).

Description

Technical Field

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

[0002] Traditional dewatering well sealing processes require backfilling, hardening, and waterproofing closure, resulting in long construction cycles. For example, backfilling requires layered compaction, and hardening takes over 8 hours, severely slowing down construction. While existing technologies have attempted to address these issues using detachable devices, such as the utility model patent CN 219671405 U, "A Sealing Structure for a Bottom Slab Dewatering Well," which uses a steel casing as the basic framework, vertically installed inside the dewatering well. Its outer wall is sealed to the inner wall of the well, providing support and protection for the internal structures. Inside the steel casing, from bottom to top, are the first concrete layer, a waterproof unit, a protective layer, a water-stop steel plate, and the second concrete layer. During construction: the steel casing is first installed in the dewatering well and sealed. After draining the water from the casing, the first concrete layer is poured and compacted. Once the first concrete layer has initially set, the first and second waterproof layers are applied sequentially to form a waterproof unit, followed by the pouring of the protective layer. Then, the water-stop steel plate is welded, and finally, the second and fourth concrete layers are poured. The drawback of this device is that the enclosed structure includes multiple components such as steel sleeves, multiple layers of concrete, waterproof units, and water-stop steel plates. The overall structure is relatively complex, and the installation process is complicated, requiring specialized tools or multiple people to work together. Utility Model Content

[0003] This application provides a rainwater well sealing device, which uses a matching locking block and a locking groove along the circumferential direction on the side of the positioning support cylinder that contacts the sealing cover. The rapid installation of both is achieved through a rotational locking design of the protrusion and the locking groove, effectively solving the problems of complex structure and complicated installation process in existing rainwater well sealing devices. Furthermore, combined with a water-stop ring and a double-sealing structure (mechanical seal + grouting seal), the reliability of waterproofing is significantly improved. The specific solution is as follows:

[0004] A sealing device for a dewatering well, the sealing device comprising: a positioning support cylinder pre-embedded at the wellhead of the dewatering well and a sealing cover plate located on top of the positioning support cylinder;

[0005] The side of the positioning support cylinder that contacts the closed cover plate has discontinuous blocks that bulge outwards along the circumference and discontinuous grooves that are recessed inwards.

[0006] A notch is provided between two adjacent card blocks or slots, and the arc length of the notch between two adjacent card blocks or slots is greater than the arc length of a single card block or slot. The shapes of the card blocks and slots are complementary. By rotating, the card blocks are inserted into the corresponding slots to achieve a detachable connection between the positioning support cylinder and the closed cover plate.

[0007] Preferably, at least four of the card blocks and card slots are provided at intervals along the circumference of the positioning support cylinder and the closing cover plate.

[0008] Preferably, the cross-section of the card block and the card slot includes either a T-shape or a dovetail shape.

[0009] Preferably, a water-stop ring is provided on the periphery of the positioning support cylinder;

[0010] The water-stop ring is fitted onto the outside of the positioning support cylinder.

[0011] Preferably, the inner diameter of the water-stop ring matches the outer diameter of the positioning support cylinder, the width of the water-stop ring is 5cm to 10cm, and the thickness of the water-stop ring is 3cm to 5cm.

[0012] Preferably, a double sealing structure is provided between the closed cover plate and the positioning support cylinder;

[0013] The dual sealing structure includes a first sealing element disposed between the connecting end face of the sealing cover plate and the positioning support cylinder, and a second sealing element disposed within the cavity formed by the sealing cover plate and the positioning support cylinder.

[0014] Preferably, the first sealing element is a sealing ring;

[0015] The inner and outer sides of the sealing ring respectively abut against the inner and outer sides of the sealing cover plate and the positioning support cylinder.

[0016] Preferably, the second sealant is a waterproof sealant slurry layer.

[0017] Preferably, the sealing cover plate is provided with grouting holes;

[0018] The grouting hole is connected to the cavity, and the grouting hole is equipped with a sealing cap;

[0019] Waterproof grout is filled or replenished through the grouting holes.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] This application provides discontinuous circumferentially distributed locking blocks on the outer side of the top of the positioning support cylinder, and corresponding locking grooves matching the position, shape, and size of the locking blocks on the inner side of the bottom of the closed cover plate. By rotating the locking blocks into the corresponding locking grooves, the positioning support cylinder and the closed cover plate can be quickly locked together, simplifying the installation process, eliminating the need for complex tools, shortening the installation time, and significantly improving construction efficiency.

[0022] This application provides a water-stop ring on the outside of the positioning support cylinder. The water-stop ring fits tightly against the well wall, effectively preventing external groundwater from seeping into the well and reducing the risk of leakage.

[0023] This application ensures high airtightness by setting a double sealing structure between the positioning support cylinder and the sealing cover plate, adapting to complex geological conditions and preventing leakage during long-term use. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the assembly of a dewatering well sealing device according to an embodiment of this application;

[0025] Figure 2 This is a cross-sectional schematic diagram of a dewatering well sealing device according to an embodiment of this application;

[0026] Figure 3 This is a bottom-view axonometric schematic diagram of a dewatering well sealing device according to an embodiment of this application;

[0027] In the diagram: 1. Closed cover plate; 2. Positioning support cylinder; 3. Water-stop ring; 4. Connecting part; 41. Locking block; 42. Locking groove; 5. Sealing cover; 6. First sealing element; 7. Second sealing element; 8. Grouting hole; 9. Notch. Detailed Implementation

[0028] The technical solutions 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.

[0029] Please see the appendix Figure 1-3 The diagram shows a sealing device for a dewatering well. The sealing device includes: a positioning support cylinder 2 pre-embedded at the wellhead of the dewatering well, a sealing cover plate 1 located on the top of the positioning support cylinder 2, and a connecting part 4 located between the top of the positioning support cylinder and the sealing cover plate.

[0030] The positioning support cylinder 2 has a discontinuous locking block 41 formed by the outer protrusion and a discontinuous locking groove 42 formed by the inward recess on the outer side where it contacts the closed cover plate 1.

[0031] A notch is provided between two adjacent card blocks 41 or card slots 42, and the arc length of the notch between two adjacent card blocks 41 or card slots 42 is greater than the arc length of a single card block or card slot. The shapes of the card blocks and card slots are complementary. By rotating, the card blocks are placed into the corresponding card slots to achieve a detachable connection between the positioning support cylinder and the closed cover plate.

[0032] The connecting part 4 includes a locking block 41 disposed on the top periphery of the positioning cylinder and a locking groove 42 disposed on the bottom inner side of the closing cover plate 1;

[0033] The locking block 41 is a discontinuous annular locking block formed by the positioning support cylinder 2 protruding outward along the circumference; the locking groove 42 is a discontinuous annular locking groove formed by the bottom of the closed cover plate 1 being recessed inward along the radial direction; the discontinuous annular locking block and the discontinuous locking groove refer to the fact that there is a gap between adjacent locking blocks and locking grooves, wherein the arc length of the gap 9 is greater than the arc length of the unit locking groove 42 and the unit locking block 41;

[0034] The shapes and sizes of the card block 41 and the card slot 42 are complementary (compatible). By rotating, the card block 41 is rotated into the corresponding card slot 42 to achieve a detachable connection between the positioning support cylinder 2 and the closed cover plate 1.

[0035] It should be noted that:

[0036] In one embodiment of this application, the cross-section of the sealing cover plate is a U-shaped structure with the bayonet facing downwards. The inner diameter of the sealing cover plate 1 is adapted to the outer diameter of the positioning support cylinder 2, so that after the two are installed, the sealing cover plate 1 covers the outer side of the top of the positioning support cylinder 2.

[0037] In one embodiment of this application, the card block 41 and the positioning support cylinder 2, as well as the card slot 42 and the closing cover plate 1, are integrally formed;

[0038] During installation, first insert the part of the closed cover plate 1 with the slot 42 into the notch between the adjacent card blocks 41, and then rotate it in the forward or reverse direction to achieve the snap-fit ​​between the two.

[0039] Furthermore, at least four of the card blocks and card slots are provided at intervals along the circumference of the positioning support cylinder and the closing cover plate.

[0040] It should be noted that:

[0041] In one embodiment of this application, four circumferentially distributed locking blocks 41 are discontinuously and uniformly arranged on the periphery of the top of the positioning support cylinder 2, and four correspondingly discontinuously and uniformly arranged slots 42 are arranged on the bottom inner side of the sealing cover plate 1, so that complete and quick locking can be achieved by rotating the sealing cover plate 1 to 90°.

[0042] Furthermore, the cross-sections of the card block 41 and the card slot 42 include either a T-shape or a dovetail shape.

[0043] It should be noted that:

[0044] In this application, the cross-sectional shape of the card block 41 and the card slot 42 can be a horizontal T-shape, with the vertical bar of the T-shape facing the positioning support cylinder 2 and the horizontal bar parallel to the axis of the positioning support cylinder, or it can be a dovetail shape, so as to achieve the stability of the connection between the two.

[0045] Furthermore, a water-stop ring 3 is provided on the periphery of the positioning support cylinder 2;

[0046] The water-stop ring 3 is sleeved on the outside of the positioning support cylinder 2.

[0047] It should be noted that:

[0048] In this application, the water-stop ring 3 is fixedly connected to the outside of the positioning support cylinder 2. In one embodiment of this application, the water-stop ring 3 and the positioning support cylinder 2 are made of the same metal material, so that the two are fixedly connected by welding.

[0049] Furthermore, the inner diameter of the water-stop ring 3 matches the outer diameter of the positioning support cylinder 2, the width of the water-stop ring 3 is 5cm~10cm, and the thickness of the water-stop ring is 3cm~5cm.

[0050] It should be noted that:

[0051] In this application, the water-stop ring 3 is located in the middle of the cylinder, which can effectively isolate the water below the raft plate.

[0052] Furthermore, a double sealing structure is provided between the closed cover plate 1 and the positioning support cylinder 2;

[0053] The double sealing structure includes a first sealing element 6 disposed between the connecting end face of the sealing cover plate 1 and the positioning support cylinder 2, and a second sealing element 7 disposed in the cavity formed by the sealing cover plate 1 and the positioning support cylinder 2.

[0054] Furthermore, the first sealing element 6 is a sealing ring;

[0055] The inner and outer sides of the sealing ring respectively abut against the inner and outer sides of the sealing cover plate 1 and the positioning support cylinder 2.

[0056] Furthermore, the second seal 7 is a waterproof sealing slurry layer.

[0057] It should be noted that:

[0058] In one embodiment of this application, an annular sealing groove matching the top position of the positioning support cylinder 2 is provided on the inner side of the top of the closed cover plate 1.

[0059] When installing the sealing cover plate 1 and the positioning support cylinder 2, the sealing ring is first installed in the sealing groove. Then, when the sealing cover plate 1 is installed on the top of the positioning support cylinder 2 by snap-fit, the sealing ring abuts against the top of the sealing cover plate and the top of the positioning support cylinder respectively to achieve the first seal between them.

[0060] Then, waterproof slurry is injected into the cavity between the side wall of the sealing cover 1 and the side wall of the positioning support cylinder 2 between the card slot 42 and the sealing cover 1 to form a sealing layer in the cavity, so as to achieve a second seal at the connection between the sealing cover 1 and the positioning support cylinder 2.

[0061] Furthermore, the sealing cover plate is provided with grouting holes 8;

[0062] The grouting hole 8 is connected to the cavity, and the grouting hole is equipped with a sealing cap 5;

[0063] Waterproof sealing grout is filled or replenished through the grouting hole 8.

[0064] It should be noted that:

[0065] In this application, the sealing cover plate is provided with a grouting hole 8, wherein the grouting hole 8 is connected to the cavity formed between the side wall of the sealing cover plate 1 and the side wall of the positioning support cylinder 2 between the locking groove 42 and the sealing cover plate 1, so as to realize that after the sealing cover plate 1 is installed in the positioning support cylinder 2 by snapping, waterproof slurry is injected into the cavity through the grouting hole 8 to form a second sealing element 7, and secondary replenishment of waterproof slurry is carried out later.

[0066] It should be noted that:

[0067] In one embodiment of this application, the positioning support cylinder 2 is made of Q235B steel with a thickness of 0.5cm to 1cm and a yield strength ≥235MPa. The inner diameter of the positioning support cylinder is adapted to the standard size of the wellhead, and the height is 50cm.

[0068] The water-stop ring 3 is made of 0.3cm thick steel plate with an outer diameter of 70cm, and is fully welded to the outer wall of the positioning support cylinder 2;

[0069] The first sealing element 6 is a rubber sealing ring with a thickness of 0.1cm. Its size matches the end size of the positioning support cylinder 2. It is bonded to the annular sealing groove of the closed cover plate 1 with fish bead adhesive. The sealing ring is made of ethylene propylene diene monomer (EPDM) rubber with a temperature range of -40℃ to 120℃ and a Shore hardness of 70±5.

[0070] The sealing cap is threaded and connects to the grouting hole via a thread, used for replenishing or injecting waterproofing material.

[0071] During construction:

[0072] First, a positioning support cylinder is pre-embedded, specifically: the positioning support cylinder is vertically installed at the wellhead of the dewatering well, and the water-stop ring is fully welded to the outside of the positioning support cylinder. The position of the water-stop ring corresponds to the waterproof layer at the wellhead, and the waterproof layer is tightly sealed at the bottom of the water-stop ring.

[0073] Then, the first seal is installed by vertically fixing the sealing ring in the sealing groove with epoxy resin.

[0074] Next, insert the closed cover plate slot into the notch between two adjacent blocks on the positioning support cylinder, and then rotate to lock it, with the torque value controlled at 30-50 N·m;

[0075] Next, waterproof grout (i.e., polyurethane foam) is injected through the grouting holes to fill the micro-gaps;

[0076] Finally, a water tightness test is conducted (0.3MPa pressure maintained for 30 minutes without leakage); the closing operation time is ≤55 minutes. This meets the construction requirements.

[0077] The following is an effect check conducted by the QC team on the dewatering well of a residential building after all the devices have been implemented.

[0078] The results of the construction time and waterproofing qualification rate of the water well rapid device are shown in Table 1 below:

[0079] Table 1. Statistics on construction time and waterproofing pass rate of rapid dewatering well installation device

[0080]

[0081] The results above show that using this device for sealing the bottom of dewatering wells reduces the original sealing time from 8 hours to 1 hour, and the waterproofing pass rate reaches 100%.

Claims

1. A sealing device for a precipitation well, characterized in that, The sealing device includes: a positioning support cylinder pre-embedded at the wellhead of the dewatering well and a sealing cover plate located on top of the positioning support cylinder; The positioning support cylinder has a discontinuous locking block formed by the outer protrusion and a discontinuous locking groove formed by the inward recess at the contact point with the closed cover plate. A notch is provided between two adjacent card blocks or slots, and the arc length of the notch between two adjacent card blocks or slots is greater than the arc length of a single card block or slot. The shapes of the card blocks and slots are complementary. By rotating, the card blocks are inserted into the corresponding slots to achieve a detachable connection between the positioning support cylinder and the closed cover plate.

2. The sealing device for a dewatering well according to claim 1, characterized in that, The card blocks and card slots are provided at least four times spaced apart along the circumference of the positioning support cylinder and the closing cover plate.

3. The sealing device for a dewatering well according to claim 1, characterized in that, The cross-section of the card block and card slot includes either a T-shape or a dovetail shape.

4. The sealing device for a dewatering well according to claim 1, characterized in that, A water-stop ring is provided on the outer side of the positioning support cylinder; The water-stop ring is fitted onto the outside of the positioning support cylinder.

5. A sealing device for a dewatering well according to claim 4, characterized in that, The inner diameter of the water-stop ring matches the outer diameter of the positioning support cylinder, the width of the water-stop ring is 5cm~10cm, and the thickness of the water-stop ring is 3cm~5cm.

6. The sealing device for a dewatering well according to claim 1, characterized in that, A double sealing structure is provided between the closed cover plate and the positioning support cylinder; The dual sealing structure includes a first sealing element disposed between the connecting end face of the sealing cover plate and the positioning support cylinder, and a second sealing element disposed within the cavity formed by the sealing cover plate and the positioning support cylinder.

7. A sealing device for a dewatering well according to claim 6, characterized in that, The first sealing element is a sealing ring; The inner and outer sides of the sealing ring respectively abut against the inner and outer sides of the sealing cover plate and the positioning support cylinder.

8. A sealing device for a dewatering well according to claim 6, characterized in that, The second sealant is a waterproof sealant slurry layer.

9. A sealing device for a dewatering well according to claim 6, characterized in that, The sealing cover plate is provided with grouting holes; The grouting hole is connected to the cavity, and the grouting hole is equipped with a sealing cap; Waterproof grout is filled or replenished through the grouting holes.

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