Vacuum dewatering structure suitable for running subway tunnel

Abstract

The utility model provides a vacuum dewatering structure suitable for running a subway tunnel. The vacuum dewatering structure comprises a steel sleeve, a vacuum pipe, a water stop ring, a filter screen and a subway track bed. A water pumping hole is preset in the subway track bed; the steel sleeve is inserted into the water pumping hole and extends to the bottom, the vacuum pipe penetrates into the steel sleeve and extends to the bottom of the water pumping hole, and the outer end of the vacuum pipe is used for being connected with vacuumizing equipment. The filter screen wraps a water inlet at the bottom end of the vacuum tube; and the water stop ring is mounted outside the steel sleeve. The structure ensures space safety operation by lowering the underground water level in advance.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, specifically to a vacuum dewatering structure suitable for operating subway tunnels. Background Technology

[0002] In construction engineering, the development of underground space projects in large cities is increasing, especially with the rapid development of subway construction technology. Shield tunneling technology and mining methods are commonly used in tunnel sections, and the distribution characteristics of groundwater vary in different strata.

[0003] The length of subway tunnel sections is generally around 2km. Due to groundwater erosion, buoyancy, and the effects of vibrations from the operation of rail vehicles and geological structures, especially the large centripetal force in the turning sections, long-term effects can cause structural damage and deformation to the bottom slab and track slab, and even cause the bottom slab to float, which is quite harmful and technically difficult to handle in emergency situations.

[0004] To prevent large-scale shutdowns in the operating sections, a bellows-style emergency response is typically adopted, which ensures the normal operation of the subway in certain areas and minimizes losses.

[0005] The main reason for subway uplift is abundant groundwater, or during periods of heavy rainfall, groundwater surges causing localized uplift. To address this, temporary measures such as installing drainage holes can be used to release pressure. However, during the final restoration process, it's crucial to ensure the groundwater is released beforehand and construction proceeds on dry ground. Yet, ensuring the timely release of groundwater during restoration is a significant challenge.

[0006] To solve this problem, there is an urgent need to develop a solution suitable for this scenario to meet construction requirements. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a vacuum dewatering structure suitable for operating subway tunnels that ensures safe operation by lowering the groundwater level in advance.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a vacuum dewatering structure suitable for operating subway tunnels, including a steel sleeve, a vacuum tube, a water-stop ring, a filter screen, and a subway track bed;

[0009] The subway track bed has pre-set water extraction holes;

[0010] The steel sleeve is inserted into the water extraction hole and extends to the bottom. The vacuum tube is inserted into the steel sleeve and extends to the bottom of the water extraction hole. The outer end of the vacuum tube is used to connect to a vacuum pumping device.

[0011] The filter screen is wrapped around the bottom inlet of the vacuum tube;

[0012] The water-stop ring is installed on the outside of the steel sleeve.

[0013] Preferably, a guide channel is provided at the upper end of the subway track bed near the water pumping hole.

[0014] Preferably, there is no sediment at the bottom of the pumping hole.

[0015] Preferably, the bottom of the steel sleeve is wrapped with a filter screen.

[0016] Preferably, the depth of the water pumping hole is ≥500mm.

[0017] Preferably, the height of the water-stop ring relative to the surface of the subway track bed is ≥200mm.

[0018] Preferably, the total length of the steel sleeve is ≥1800mm.

[0019] Preferably, the vacuum tube is made of a transparent rigid steel wire tube.

[0020] Preferably, the filter screen wrapped around the lower end of the vacuum tube is a double-layer filter screen.

[0021] Preferably, the vacuuming device is a vacuum pump.

[0022] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model temporarily sets up the aforementioned vacuum dewatering device in the underground water-rich layer. By lowering the groundwater level in advance, it ensures safe operation in the space. Specifically, first, a concrete core is extracted using a water drill, then a hole is drilled to the initial support layer of the tunnel using a hand-held pneumatic drill, a V-shaped guide groove is removed, a vacuum tube is installed, a water-stop ring is welded, a vacuum tube is inserted into the hole, and an external vacuum pump or self-priming pump is connected. The hole opening is sealed tightly to ensure that a vacuum negative pressure state is formed inside the tube, thus expanding the seepage radius.

[0023] The steel sleeves, vacuum tubes, water-stop rings, filters, and other components used can all be manufactured according to standardized procedures and installed on-site. This allows for easy material sourcing, on-site fabrication, controllable process quality, and simple operation. The device is robust, durable, removable, reusable, resource-saving, and environmentally friendly, making it suitable for widespread application. Attached Figure Description

[0024] Figure 1 This is a structural principle diagram of a vacuum dewatering structure applicable to operating subway tunnels, which is part of this utility model.

[0025] In the diagram: 1. Steel sleeve; 2. Vacuum tube; 3. Water-stop ring; 4. Filter screen; 5. Subway track bed. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0027] like Figure 1 As shown, a vacuum dewatering structure suitable for operating subway tunnels includes a steel sleeve 1, a vacuum tube 2, a water-stop ring 3, a filter screen 4, and a subway track bed 5.

[0028] The subway track bed 5 has pre-set water extraction holes. Specifically, the water extraction holes are obtained by cleaning and washing the holes after core sampling is completed in the tunnel using a water drill or a hand drill, ensuring that there is no sediment inside the holes.

[0029] The steel sleeve 1 is inserted into the water extraction hole and extends to the bottom. A filter screen is installed at the bottom of the steel sleeve 1 to prevent new impurities from entering the interior of the steel sleeve.

[0030] The vacuum tube 2 is inserted into the steel sleeve 1 and extends to the bottom of the water pumping hole. The outer end of the vacuum tube 2 is used to connect to a vacuum pumping device or a water pump to form a water pumping device.

[0031] In this embodiment, the vacuum tube 2 is a transparent rigid steel wire tube with a double-layer filter screen wrapped around its bottom end. It generally extends below the water surface to form an effective water pumping device. In a preferred embodiment, the opening of the water pumping hole is sealed to create a negative pressure environment inside the hole.

[0032] The water-stop ring 3 is installed on the outside of the steel sleeve 1, and a guide groove is set at the upper end of the subway track bed near the water pumping hole to guide the ground water into the water pumping hole.

[0033] In terms of dimensions, the depth of the water extraction hole is ≥500mm, the corresponding height of the water-stop ring relative to the surface of the subway track bed is ≥200mm, and the total length of the steel sleeve is ≥1800mm.

[0034] This structure can be used in subway tunnels in areas with abundant groundwater, or during seasons with heavy rainfall, especially when groundwater gushing causes local uplift.

[0035] In general, the solution involves drilling to a certain depth using water drills and hand drills. Depending on the depth of the groundwater, it is determined whether the steel casing will penetrate the initial support and waterproof layer. By pre-embedding the steel casing, a hole is opened within 20cm of the bottom for leakage. Then, a double-layer filter screen is wrapped around the bottom of a transparent steel wire tube, and an external vacuum pump or self-priming pump is connected for automatic drainage to ensure that the water level is below the operating level, allowing for dry work on site.

[0036] Finally, it should be noted that: the preferred embodiments of this patent have been described in detail above, but this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A vacuum dewatering structure suitable for operating subway tunnels, characterized in that: Includes steel casing, vacuum tube, water-stop ring, filter screen and subway track bed; The subway track bed has pre-set water extraction holes; The steel sleeve is inserted into the water extraction hole and extends to the bottom. The vacuum tube is inserted into the steel sleeve and extends to the bottom of the water extraction hole. The outer end of the vacuum tube is used to connect to a vacuum pumping device. The filter screen is wrapped around the bottom inlet of the vacuum tube; The water-stop ring is installed on the outside of the steel sleeve.

2. The vacuum dewatering structure for operating subway tunnels according to claim 1, characterized in that: A guide channel is installed at the upper end of the subway track bed near the water extraction hole.

3. The vacuum dewatering structure suitable for operating subway tunnels according to claim 1 or 2, characterized in that: There is no sediment at the bottom of the pumping hole.

4. The vacuum dewatering structure suitable for operating subway tunnels according to claim 1, characterized in that: The bottom of the steel sleeve is wrapped with a filter screen.

5. The vacuum dewatering structure for operating subway tunnels according to claim 3, characterized in that: The depth of the pumping hole is ≥500mm.

6. The vacuum dewatering structure suitable for operating subway tunnels according to claim 1, characterized in that: The height of the water-stop ring relative to the surface of the subway track bed is ≥200mm.

7. The vacuum dewatering structure suitable for operating subway tunnels according to claim 1, characterized in that: The total length of the steel casing is ≥1800mm.

8. The vacuum dewatering structure for operating subway tunnels according to claim 1, characterized in that: The vacuum tube is made of transparent rigid steel wire.

9. The vacuum dewatering structure suitable for operating subway tunnels according to claim 1, characterized in that: The filter screen wrapped around the lower end of the vacuum tube is a double-layer filter screen.

10. The vacuum dewatering structure for operating subway tunnels according to claim 1, characterized in that: The vacuuming device is a vacuum pump.

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