Water-rich sand layer deep tube well plugging device

Abstract

The utility model discloses a water-rich sand layer deep tube well plugging device which comprises a ground concrete layer, a raft foundation layer, a concrete cushion layer, a gravel layer and a steel sleeve, the steel sleeve is arranged in a downcast tube well, ground concrete is arranged on the top layer, the ground concrete layer is arranged at the bottom of the raft foundation layer, and the concrete cushion layer is arranged at the bottom of the gravel layer. The gravel layer is arranged at the bottom of the ground concrete layer, the device further comprises a threading steel plate, the threading steel plate is matched with the inner diameter of a steel sleeve of the downcast tube well to form a first-layer plugging structure, the device further comprises a screwed plug, and the screwed plug plugs the threading steel plate and is matched with the threading steel plate to form a second-layer plugging structure. Compared with similar downcast pipe plugging, the plugging device for the deep tube well in the water-rich sand layer has the advantages that a site is easy to arrange, the project progress is fast, interference factors are few, and rapid and efficient construction is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering construction, and particularly relates to a deep pipe well plugging device in a water-rich sand layer. Background Art

[0002] With the economic development of our country, high-rise buildings are becoming more and more popular. With the birth of high-rise buildings, deep foundation pit construction has shown a normal trend. One of the difficulties in deep foundation pit construction is to solve the problem of groundwater. The method of using precipitation pipe wells for precipitation is simple, economical and applicable, and has been applied in many projects; but in the process of deep foundation pit construction, due to the large precipitation depth and large diameter of precipitation pipe wells, water gushing from the wellhead will occur during the sealing process. Therefore, how to effectively and quickly seal precipitation wells with deep precipitation depth and large diameter has also become a problem that must be considered in today's buildings. Summary of the invention

[0003] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a water-rich sand layer deep pipe well plugging device, the device includes a ground concrete layer, a raft foundation layer, a concrete cushion layer, a crushed stone layer and a steel casing, the steel casing is arranged in the downdraft pipe well, the ground concrete is arranged on the top layer, the ground concrete layer is arranged at the bottom of the raft foundation layer, and the crushed stone layer is arranged at the bottom of the ground concrete layer.

[0004] As an improvement of the present utility model, the device also includes a threaded steel plate, which is matched with the inner diameter of the steel casing of the downcomer well to form a first layer of blocking structure. The device also includes a threaded plug, which blocks the threaded steel plate and is matched with the threaded steel plate.

[0005] Based on the above technical features, the connection between the steel pipe thread and the thread plug must be tight.

[0006] As an improvement of the utility model, the device further comprises a steel plate, and the steel plate is matched and connected with the inner diameter of the steel casing of the downcomer.

[0007] As an improvement of the utility model, the device further comprises a waterproof layer, and an additional layer of waterproof coiled material is provided between the steel casing and the waterproof layer, and the width of the additional layer of waterproof coiled material is not less than 300 mm.

[0008] Based on the above technical features, the waterproofing treatment between the steel casing and the waterproof layer is strict, and an additional layer of waterproof membrane is set there to improve the waterproof tightness of the construction.

[0009] As an improvement of the utility model, groove welding is adopted between the threaded steel plate and the steel casing.

[0010] Based on the above technical characteristics, the intersection of the steel casing and the steel plate with threaded steel pipe must be cleaned, and the welding between the threaded steel plate and the waterproof sleeve adopts groove welding. The weld height is not less than 8mm.

[0011] As an improvement of the utility model, the device also includes a drainage device, which pumps water from the downpipe well to a sump, and a sewage pump is arranged in the sump to pump water to a ground drainage system.

[0012] As an improvement of the utility model, a water stop ring is provided on the steel casing.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: compared with similar downcomer plugging methods, the water-rich sand layer deep pipe well plugging device in the utility model is easy to arrange the site, has a fast project progress, has fewer interference factors, is conducive to fast and efficient construction, can ensure the intact use of surrounding equipment, and will not affect the use of the site due to plugging equipment; a one-time investment can completely block the path of water leakage, avoid rework due to leakage, and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of welding and plugging of the plugging device and the steel casing in this embodiment;

[0015] Figure 2 Schematic diagram of the overall structure of the blocking device in this embodiment;

[0016] Figure 3 This is a schematic diagram of the steel casing structure in this embodiment;

[0017] Figure 4 This is a schematic diagram of the steel plate with holes drilled and then welded to a steel pipe structure in this embodiment;

[0018] Figure 5 This is a schematic diagram of the matching of the plug and the steel pipe thread in this embodiment.

[0019] List of illustration symbols: 1-ground concrete, 2-raft foundation layer, 3-concrete cushion layer, 4-steel casing, 5-gravel backfill structure, 6-plug threaded sealing structure, 7-water stop ring, 8-plug, 9-steel pipe thread, 10-cement sandless downdraft pipe, 11-steel plate. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0021] The present embodiment is a water-rich sand layer deep pipe well plugging device, the device includes a ground concrete layer 1, a raft foundation layer 2, a concrete cushion layer 3, a crushed stone layer and a steel casing 4, the steel casing 4 is arranged in the downdraft pipe well, the ground concrete 1 is arranged on the top layer, the ground concrete layer 1 is arranged at the bottom of the raft foundation layer 2, and the crushed stone layer is arranged at the bottom of the ground concrete layer 1.

[0022] Furthermore, the device also includes a threaded steel plate 11, which is matched with the inner diameter of the steel casing 4 of the downpipe well to form a first layer of blocking structure. The device also includes a threaded plug, which blocks the threaded steel plate 11 and is matched with the threaded steel plate 11. The connection between the steel pipe thread 9 and the threaded plug must be tight.

[0023] Furthermore, the device also includes a steel plate 11, and the steel plate 11 is matched and connected with the inner diameter of the steel casing 4 of the downcomer.

[0024] Furthermore, the device also includes a waterproof layer, and an additional layer of waterproof roll material is provided between the steel casing 4 and the waterproof layer. The width of the additional layer of waterproof roll material is not less than 300 mm. The waterproof treatment between the steel casing 4 and the waterproof layer is strict, and the additional layer of waterproof roll material is provided there, which improves the waterproof tightness of the construction.

[0025] Furthermore, groove welding is used between the threaded steel plate 11 and the steel casing 4, the junction between the steel casing 4 and the steel plate 11 with wire must be cleaned, and groove welding is used between the threaded steel plate 11 and the waterproof sleeve. The weld height is not less than 8mm.

[0026] Furthermore, the device also includes a drainage device, which pumps water from the downpipe well to a sump, and a sewage pump is arranged in the sump to pump water to a ground drainage system.

[0027] Furthermore, a water stop ring 7 is provided on the steel casing 4 .

[0028] When the design document stipulates that precipitation can be stopped, plan the order of well sealing in advance according to the amount of water output, and reasonably select the model of self-priming pump according to the water output. For details, see the working diagram of the water pump before sealing Figure 1. Prepare the materials for sealing the well, take out the submersible pump, use a self-priming pump to replace the submersible pump in the well pipe to pump water, backfill the well pipe with graded sand and gravel, and stop backfilling when backfilling to the bottom of the raft foundation. When the thickness of the raft concrete exceeds 400mm, pour the micro-expansion anti-seepage concrete of one grade higher than the original design to 400mm below the steel casing 4, weld the water-stop steel plate 11 with threaded steel pipe, pull the self-priming pump pipe out of the threaded steel pipe, and use special tools to thread the plug and the thread to seal. If the drainage pipe well is sealed according to the principle of group well dewatering, wait until the water-stop steel plate 11 with threaded steel pipe and the steel casing 4 of the remaining drainage pipe wells are all welded, and then use the plug to seal uniformly to avoid water gushing during the sealing process. After the plug is sealed, observe for 24 hours without leakage, and pour the upper part with micro-expansion anti-seepage concrete of one grade higher than the original design. At a distance of 10mm from the raft foundation, a 5mm thickened water-stop steel plate 11 is welded to the steel casing 4 again for sealing, and decorative concrete is poured on the upper layer of the steel casing 4. Figure 2 .

[0029] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A plugging device for deep pipe wells in water-rich sand layers, characterized in that: The device comprises a ground concrete layer, a raft foundation layer, a concrete cushion layer, a crushed stone layer and a steel casing, wherein the steel casing is arranged in a downcomer well, the ground concrete is arranged on the top layer, the ground concrete layer is arranged at the bottom of the raft foundation layer, and the crushed stone layer is arranged at the bottom of the ground concrete layer.

2. A water-rich sand layer deep tube well plugging device according to claim 1, characterized in that: The device also includes a threaded steel plate, which is matched with the inner diameter of the steel casing of the downcomer well to form a first layer of blocking structure. The device also includes a threaded plug, which blocks the threaded steel plate and is matched with the threaded steel plate.

3. A water-rich sand layer deep tube well plugging device according to claim 1, characterized in that: The device also includes a steel plate, which is matched and connected to the inner diameter of the steel casing of the downcomer.

4. A water-rich sand layer deep tube well plugging device according to claim 1, characterized in that: The device also includes a waterproof layer, and an additional layer of waterproof coiled material is provided between the steel casing and the waterproof layer, and the width of the additional layer of waterproof coiled material is not less than 300 mm.

5. A water-rich sand layer deep tube well plugging device according to claim 2, characterized in that: The threaded steel plate and the steel casing are welded by groove welding.

6. A water-rich sand layer deep tube well plugging device according to claim 1, characterized in that: The device also includes a drainage device, which pumps water from the downpipe well to a sump, and a sewage pump is arranged in the sump to pump water to a ground drainage system.

7. A plugging device for deep tube wells in water-rich sand layers according to claim 1, characterized in that: A water stop ring is arranged on the steel casing.

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