A foundation pit gushing rescue self-balancing rapid well forming method and a dewatering well device

Abstract

The application provides a foundation pit sudden gushing emergency rescue self-balancing rapid well forming method and a dewatering well device, and steps are as follows: S1, a sleeve pipe with a filter pipe inside is pressed into the soil, a double water stop device is connected between the top outer wall of the filter pipe and the bottom inner wall of the sleeve pipe; S2, a temporary steel pipe is extended downward into the sleeve pipe and presses the filter pipe downward; S3, the sleeve pipe is pulled upward so that the filter pipe is exposed in the soil; S4, the temporary steel pipe is recycled, and the sleeve pipe and the filter pipe left in the soil serve as a dewatering well. Compared with conventional well forming, the construction period of the application can be shortened by 2 / 3, and the dewatering operation can be rapidly completed, which saves valuable time for the emergency rescue work; after the sleeve pipe is pulled upward, on the one hand, the filter pipe is exposed in the soil, the contact area with underground water is increased, and the dewatering speed is improved; on the other hand, the double water stop device can effectively prevent mud and water from entering the center hole from the gap between the sleeve pipe and the filter pipe.

Description

Technical Field

[0001] This invention relates to the field of foundation pit construction, specifically to a self-balancing rapid well-forming method and dewatering well device for emergency foundation pit bursting. Background Technology

[0002] Sudden water inrush is a concern during the excavation of foundation pits to the bottom. Currently, dewatering is the most common method to prevent this. However, conventional dewatering well construction methods have some drawbacks.

[0003] First, conventional dewatering well construction involves drilling a hole and then running a well casing and filter media. This process is complex, requiring large amounts of drilling mud and materials, and the discharge of this mud causes significant pollution. Second, this method causes considerable disturbance to the formation during drilling, making the pit more prone to sudden water inrush. Therefore, in situations requiring urgent dewatering or emergency rescue, this method is inefficient, has relatively high labor costs, and can delay rescue efforts, failing to meet the needs of the project.

[0004] In conclusion, dewatering in foundation pit engineering is a problem that requires attention and resolution. Conventional dewatering well construction methods have some issues, necessitating improvements to enhance efficiency and meet engineering requirements. Summary of the Invention

[0005] This invention provides a self-balancing rapid well-drilling method and dewatering well device for emergency response to sudden water inrush in foundation pits. Its advantages include rapid construction, simple process, energy saving and environmental protection, material saving, minimal disturbance to the formation, and a double water-stopping device design. These advantages make this invention widely applicable in emergency response, foundation pit dewatering, and other fields. The specific solution is as follows:

[0006] A self-balancing rapid well-drilling method for emergency response to sudden water inrush in foundation pits, the method comprising the following steps:

[0007] S1. Press the outer sleeve containing the water filter pipe into the soil. The water filter pipe is installed at the bottom of the outer sleeve, and the lower end face of the water filter pipe is provided with a sealing device that simultaneously seals the bottom openings of the water filter pipe and the outer sleeve. The central holes of the water filter pipe and the outer sleeve are connected. A double water-stopping device is connected between the top outer wall of the water filter pipe and the bottom inner wall of the outer sleeve.

[0008] S2. Insert the temporary steel pipe downwards into the outer sleeve and press the filter pipe downwards;

[0009] S3. Pull the outer sleeve upwards to expose the filter pipe in the soil;

[0010] S4. Recover the temporary steel pipe, and leave the outer casing and the filter pipe in the soil as dewatering wells.

[0011] Furthermore, the sealing device is a conical pile shoe, and a perforated metal plate is installed on the upper end face of the filter pipe.

[0012] Furthermore, the outer sleeve is composed of at least one prefabricated steel pipe connected end to end, and adjacent prefabricated steel pipes are fixedly connected by flanges.

[0013] The filter pipe is installed inside the bottom of the lowest section of the outer casing.

[0014] Furthermore, the double water-stopping device is provided with a waterproof cloth and a backflow preventer steel plate from the inside out, and the waterproof cloth is located between the backflow preventer steel plate and the center hole of the filter pipe;

[0015] The anti-reverse steel plate is composed of an upper water-stop ring and a lower water-stop ring. The upper water-stop ring is fixedly fitted on the top outer wall of the filter pipe, and the lower water-stop ring is fixedly installed on the bottom inner wall of the outer sleeve. A distance is left between the upper water-stop ring and the inner wall of the outer sleeve, and between the lower water-stop ring and the outer wall of the filter pipe.

[0016] The waterproof cloth is an annular folded rubber waterproof cloth folded between the outer wall of the filter pipe and the inner wall of the outer sleeve. The inner ring of the waterproof cloth is sealed to the top outer edge of the filter pipe, and the outer ring of the waterproof cloth is sealed to the inner wall of the outer sleeve. The outer ring of the waterproof cloth is located above the lower end face of the outer sleeve.

[0017] In step S3, the outer sleeve is pulled upwards until the lower water-stop ring and the upper water-stop ring overlap and connect, and the waterproof cloth is unfolded.

[0018] Furthermore, the upper and lower water-stop rings are conical rings with the same slope and arched upwards.

[0019] A dewatering well device for emergency rescue of sudden water infill in foundation pits, comprising an outer casing pressed into the soil, a filter pipe exposed in the soil at the bottom of the outer casing, the filter pipe and the center hole of the outer casing being connected, a double water-stopping device connecting the outer wall of the filter pipe and the inner wall of the outer casing, and a sealing device connecting the bottom opening of the filter pipe.

[0020] Furthermore, the filter pipe is a bridge-type filter pipe with an outer diameter smaller than the inner diameter of the outer sleeve.

[0021] Furthermore, the sealing device is a conical pile shoe, and a perforated metal plate is installed on the upper end face of the filter pipe.

[0022] Furthermore, the double water-stopping device is provided with a waterproof cloth and a backflow preventer steel plate from the inside out, and the waterproof cloth is located between the backflow preventer steel plate and the center hole of the filter pipe;

[0023] The anti-reverse steel plate is composed of an upper water-stop ring and a lower water-stop ring. The upper water-stop ring is fixedly fitted on the top outer wall of the filter pipe, and the lower water-stop ring is fixedly installed on the bottom inner wall of the outer sleeve. There is a distance between the upper water-stop ring and the inner wall of the outer sleeve, and between the lower water-stop ring and the outer wall of the filter pipe. The lower water-stop ring and the upper water-stop ring are connected by overlapping.

[0024] The waterproof cloth is an annular folded rubber waterproof cloth connected between the outer wall of the filter pipe and the inner wall of the outer sleeve. The inner ring of the waterproof cloth is sealed to the top outer edge of the filter pipe, and the outer ring of the waterproof cloth is sealed to the upper inner wall of the outer sleeve.

[0025] Furthermore, the upper and lower water-stop rings are conical rings with the same slope and arched upwards.

[0026] The advantages of this invention are as follows:

[0027] 1. Rapid construction. Compared with conventional well construction, the construction cycle of this invention can be shortened by 2 / 3. Especially in emergency rescue scenarios where every second counts, it can quickly complete the dewatering operation, saving valuable time for rescue work.

[0028] 2. Simple process. The construction of this invention does not require large equipment and is suitable for construction in complex scenarios with low clearance at the bottom of the foundation pit. This makes the construction process more flexible and adaptable, reducing construction difficulty and cost.

[0029] 3. This invention does not produce mud, meeting the requirements of energy conservation and environmental protection. During construction, it will not generate mud that pollutes the environment, complying with modern society's environmental protection standards.

[0030] 4. After the dewatering is completed, the well casing can be removed, and the materials can be recycled, saving materials. This not only reduces material costs but also aligns with the concept of sustainable development.

[0031] 5. The precipitation method of this invention causes minimal disturbance to the formation, avoiding secondary damage to the formation caused by sudden inrush in the foundation pit, which can lead to deformation or even instability of the foundation pit retaining structure, as is common in conventional well drilling. This ensures the stability of the foundation pit and reduces the risk of foundation pit accidents.

[0032] 6. A deployable double-layer water-stop device is installed between the filter pipe and the outer casing. When the outer casing is pulled upwards, the filter pipe is exposed to the soil, increasing the contact area with groundwater and improving the dewatering speed. Furthermore, the double-layer water-stop device effectively prevents muddy water from entering the central hole through the gap between the outer casing and the filter pipe; groundwater can only enter the central hole through the holes in the side wall of the filter pipe. This makes the dewatering effect more stable and reliable. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of an outer casing with an internally installed water filter pipe and a double water-stopping device;

[0035] Figure 2 This is a schematic diagram of the assembly of the filter pipe and the outer sleeve;

[0036] Figure 3 This is a schematic diagram showing the double waterproofing device unfolded after the outer sleeve is pulled upwards.

[0037] Figure 4-7 This is a flowchart of the rapid well-drilling process of the present invention, wherein,

[0038] Figure 4 To be Figure 1 The diagram shows the outer casing being pressed into the soil.

[0039] Figure 5 In order to be in Figure 4 A schematic diagram showing the addition of an outer sleeve to the base and continued downward pressure;

[0040] Figure 6 A schematic diagram showing the insertion of a temporary steel pipe into the outer sleeve and the downward pressing of the filter pipe;

[0041] Figure 7 A schematic diagram illustrating how to quickly form a dewatering well by pulling the outer casing upwards. Detailed Implementation

[0042] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0043] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0044] Reference Figure 4-7 As shown, this invention provides a self-balancing rapid well-drilling method for emergency response to sudden foundation pit inrush, comprising the following steps:

[0045] S1. Press the outer casing 100, which contains the filter pipe 200 inside the first section, into the soil, such as... Figure 4 As shown, after pressing to a certain depth, the second section of the outer casing 100 is installed on top of the first section of the outer casing 100 via flange 102. This process is repeated after each pressing to a certain depth, with the outer casing 100 installed on top and the pressing continued until the entire outer casing 100 reaches the well depth. Figure 5 As shown.

[0046] The bridge-type filter pipe 200 is installed inside the bottom of the lowest outer sleeve 100, and a sealing device 300 that simultaneously seals the bottom openings of both the filter pipe 200 and the outer sleeve 100 is fixedly installed on the lower end face of the filter pipe 200. Preferably, the sealing device 300 is a conical pile shoe, which allows the lowest outer sleeve 100 to effectively pierce the soil. The central holes of the filter pipe 200 and the outer sleeve 100 are connected, and a perforated metal plate 201 is installed on the upper end face of the filter pipe 200 to perform a filtering function.

[0047] A double water-stop device 400 connects the top outer wall of the filter pipe 200 to the bottom inner wall of the outer sleeve 100. The double water-stop device 400 consists of a waterproof cloth 420 and a backflow preventer plate 410 arranged sequentially from the inside out. The waterproof cloth 420 is located between the backflow preventer plate 410 and the center hole of the filter pipe 200. The backflow preventer plate 410 consists of an upper water-stop ring 411 and a lower water-stop ring 412. The upper water-stop ring 411 is fixedly fitted onto the top outer wall of the filter pipe 200, and the lower water-stop ring 412 is fixedly installed on the bottom inner wall of the outer sleeve 100. Distances are maintained between the upper water-stop ring 411 and the inner wall of the outer sleeve 100, and between the lower water-stop ring 412 and the outer wall of the filter pipe 200, to prevent scratching of the outer sleeve 100 and the filter pipe 200 during the upward pulling of the outer sleeve 100.

[0048] Preferably, the upper water-stop ring 411 and the lower water-stop ring 412 are conical rings with the same slope and arched upwards (e.g., Figure 2 As shown), its advantages are: 1) the upper water-stop ring 411 and the lower water-stop ring 412 can fit well when they overlap; 2) it prevents mud and water from entering the outer sleeve from the gap between the upper water-stop ring 411 and the lower water-stop ring 412 under the action of gravity.

[0049] The waterproof fabric 420 is a ring-shaped folded rubber waterproof fabric folded between the outer wall of the filter pipe 200 and the inner wall of the outer sleeve 100. The inner ring of the waterproof fabric 420 is sealed to the top outer edge of the filter pipe 200, and the outer ring of the rubber waterproof fabric 420 is sealed to the upper inner wall of the outer sleeve 100. The outer ring of the waterproof fabric 420 is located above the lower end face of the outer sleeve 100, which facilitates the unfolding of the waterproof fabric after the outer sleeve 100 is pulled upwards.

[0050] S2. Using the winch 600, the temporary steel pipe 500 is extended downwards into the outer casing 100 and pressed down to tighten the filter pipe 200. Figure 6 As shown, the external driver rotates the winch handle 602, causing the winch chassis 601 to move downwards, which in turn moves the temporary steel pipe 500 downwards until it is pressed against the upper surface of the perforated metal plate 201. The temporary steel pipe 500 provides downward pressure to the filter pipe 200, ensuring that the filter pipe 200 does not rise with the outer sleeve 100 when it is pulled upwards in the subsequent step S3.

[0051] S3. Pull the outer sleeve 100 upwards while keeping the filter pipe 200 stationary, exposing the filter pipe 200 to the soil. After the outer sleeve 100 rises, the lower water-stop ring 412 and the upper water-stop ring 411 overlap and connect to form the first-level water-stop mechanism; simultaneously, the outer edge of the waterproof cloth 420 rises and unfolds along with the outer sleeve 100 to form the second-level water-stop mechanism. This two-level water-stop mechanism effectively prevents mud and water from entering the central hole through the gap between the outer sleeve 100 and the filter pipe 200, ensuring that groundwater can only enter the central hole through the holes outside the filter pipe 200. Furthermore, the second-level water-stop mechanism of the rubber waterproof cloth is located inside the first-level water-stop mechanism of the anti-reverse steel plate, which improves the service life of the waterproof cloth 420 and prevents it from being cut by foreign objects in the soil during the rising process.

[0052] S4. The temporary steel pipe 500 is recovered by the hoisting equipment 600, and the outer casing 100 and the filter pipe 200 left in the soil serve as dewatering wells.

[0053] Figure 7 The diagram shown is a schematic of the final dewatering well device of the present invention. The dewatering well device includes an outer casing 100 pressed into the soil. A filter pipe 200 exposed in the soil is provided at the bottom of the outer casing 100. The filter pipe 200 and the center hole of the outer casing 100 are connected. A double water-stopping device 400 is connected between the outer wall of the filter pipe 200 and the inner wall of the outer casing 100. A sealing device 300 is connected to the bottom opening of the filter pipe 200.

[0054] The double water-stopping device 400 consists of a waterproof cloth 420 and a backflow preventer plate 410 arranged sequentially from the inside out. The waterproof cloth 420 is located between the backflow preventer plate 410 and the center hole of the filter pipe 200. The backflow preventer plate 410 is composed of an upper water-stopping ring 411 and a lower water-stopping ring 412. The upper water-stopping ring 411 is fixedly fitted onto the top outer wall of the filter pipe 200, and the lower water-stopping ring 412 is fixedly installed on the bottom inner wall of the outer sleeve 100. A distance is left between the upper water-stopping ring 411 and the inner wall of the outer sleeve 100, and between the lower water-stopping ring 412 and the outer wall of the filter pipe 200. The lower water-stopping ring 412 and the upper water-stopping ring 411 are overlapped. The upper water-stopping ring 411 and the lower water-stopping ring 412 are conical rings with the same slope and arched upwards.

[0055] The waterproof cloth 420 is an annular folded rubber waterproof cloth connected between the outer wall of the filter pipe 200 and the inner wall of the outer sleeve 100. The inner ring of the waterproof cloth 420 is sealed to the top outer edge of the filter pipe 200, and the outer ring of the rubber waterproof cloth 420 is sealed to the upper inner wall of the outer sleeve 100.

[0056] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A self-balancing rapid well-drilling method for emergency response to sudden water inrush in foundation pits, characterized in that, The method includes the following steps: S1. Press the outer sleeve (100) containing the internal filter pipe (200) into the soil. The filter pipe (200) is installed at the bottom of the outer sleeve (100), and the lower end face of the filter pipe (200) is provided with a sealing device (300) that simultaneously seals the bottom openings of the filter pipe (200) and the outer sleeve (100). The central holes of the filter pipe (200) and the outer sleeve (100) are connected. A double water-stopping device (400) is connected between the top outer wall of the filter pipe (200) and the bottom inner wall of the outer sleeve (100). S2. Insert the temporary steel pipe (500) downward into the outer sleeve (100) and press the filter pipe (200) downward. S3. Pull the outer sleeve (100) upward so that the filter pipe (200) is exposed in the soil; S4. The temporary steel pipe (500) is recovered, and the outer casing (100) and the filter pipe (200) left in the soil serve as dewatering wells; The double water-stopping device (400) is provided with a waterproof cloth (420) and a backflow preventer plate (410) from the inside out. The waterproof cloth (420) is located between the backflow preventer plate (410) and the center hole of the filter pipe (200). The anti-reverse steel plate (410) is composed of an upper water-stop ring (411) and a lower water-stop ring (412). The upper water-stop ring (411) is fixedly fitted on the top outer wall of the filter pipe (200), and the lower water-stop ring (412) is fixedly installed on the bottom inner wall of the outer sleeve (100). There is a distance between the upper water-stop ring (411) and the inner wall of the outer sleeve (100), and between the lower water-stop ring (412) and the outer wall of the filter pipe (200). The waterproof cloth (420) is an annular folded rubber waterproof cloth folded between the outer wall of the filter pipe (200) and the inner wall of the outer sleeve (100). The inner ring of the waterproof cloth (420) is sealed to the top outer edge of the filter pipe (200), and the outer ring of the waterproof cloth (420) is sealed to the inner wall of the outer sleeve (100). The outer ring of the waterproof cloth (420) is located above the lower end face of the outer sleeve (100). In step S3, the outer sleeve (100) is pulled upward until the lower water-stop ring (412) and the upper water-stop ring (411) overlap and connect, and the waterproof cloth (420) is unfolded.

2. The self-balancing rapid well-forming method for emergency foundation pit inrush rescue as described in claim 1, characterized in that, The sealing device (300) is a conical pile shoe, and a perforated metal plate (201) is installed on the upper end face of the filter pipe (200).

3. The self-balancing rapid well-forming method for emergency foundation pit inrush rescue as described in claim 1, characterized in that, The outer sleeve (100) is composed of at least one prefabricated steel pipe connected end to end, and the upper and lower adjacent prefabricated steel pipes are fixedly connected by flanges (102); The filter pipe (200) is installed inside the bottom of the lowest outer sleeve (100).

4. The self-balancing rapid well-forming method for emergency foundation pit inrush rescue as described in claim 1, characterized in that, The upper water-stop ring (411) and the lower water-stop ring (412) are conical rings with the same slope and arched upwards.

5. A dewatering well device for emergency rescue of sudden foundation pit inrush, the dewatering well device comprising an outer casing (100) pressed into the soil, characterized in that, The bottom of the outer sleeve (100) is provided with a filter pipe (200) exposed in the soil. The filter pipe (200) and the center hole of the outer sleeve (100) are connected. A double water-stopping device (400) is connected between the outer wall of the filter pipe (200) and the inner wall of the outer sleeve (100). A sealing device (300) is connected to the bottom opening of the filter pipe (200). The double water-stopping device (400) is provided with a waterproof cloth (420) and a backflow preventer plate (410) from the inside out. The waterproof cloth (420) is located between the backflow preventer plate (410) and the center hole of the filter pipe (200). The anti-reverse steel plate (410) is composed of an upper water-stop ring (411) and a lower water-stop ring (412). The upper water-stop ring (411) is fixedly fitted on the top outer wall of the filter pipe (200), and the lower water-stop ring (412) is fixedly installed on the bottom inner wall of the outer sleeve (100). There is a distance between the upper water-stop ring (411) and the inner wall of the outer sleeve (100) and between the lower water-stop ring (412) and the outer wall of the filter pipe (200). The lower water-stop ring (412) and the upper water-stop ring (411) are connected by overlapping. The waterproof cloth (420) is an annular folded rubber waterproof cloth connected between the outer wall of the filter pipe (200) and the inner wall of the outer sleeve (100). The inner ring of the waterproof cloth (420) is sealed to the top outer edge of the filter pipe (200), and the outer ring of the waterproof cloth (420) is sealed to the upper inner wall of the outer sleeve (100).

6. The precipitation well device as described in claim 5, characterized in that, The filter pipe (200) is a bridge-type filter pipe (200) with an outer diameter smaller than the inner diameter of the outer sleeve (100).

7. The dewatering well device as described in claim 5, characterized in that, The sealing device (300) is a conical pile shoe, and a perforated metal plate (201) is installed on the upper end face of the filter pipe (200).

8. The precipitation well device as described in claim 7, characterized in that, The upper water-stop ring (411) and the lower water-stop ring (412) are conical rings with the same slope and arched upwards.

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