A pressure relief pipe structure for dispersing deep tunnel high pressure trapped air masses

Abstract

The application discloses a pressure relief pipeline structure for dispersing high-pressure trapped air mass in a deep tunnel, comprising a plurality of pressure relief pipelines in communication with a deep drainage tunnel, wherein the pressure relief pipelines are located at the top of the deep drainage tunnel, each of the pressure relief pipelines extends along the axial direction of the deep drainage tunnel, the plurality of pressure relief pipelines are sequentially and staggeredly arranged on the deep drainage tunnel, and the end portions of two adjacent pressure relief pipelines cross each other in the horizontal direction. The application can disperse the high-pressure trapped air mass in the deep tunnel drainage system into a plurality of small-volume air masses by step-by-step pressure relief and energy dissipation without affecting the flow section of the deep tunnel drainage system, so that the air explosion phenomenon of the deep tunnel drainage system is avoided.

Description

Technical Field

[0001] This invention belongs to the field of municipal deep tunnel engineering technology, and in particular relates to a pressure relief pipeline structure for dispersing high-pressure interception gas masses in deep tunnels. Background Technology

[0002] Under heavy rainfall conditions, deep tunnel drainage systems are rapidly filled with rainwater, which carries a large amount of air into the tunnel. The air that cannot be discharged in time is trapped inside, forming a high-pressure trapped air mass. This causes violent oscillations in the water flow inside the tunnel and generates transient flows with alternating open and closed flow. This results in problems such as high system pressure, overflow, surges, or manhole cover displacement, which have a negative impact on the urban environment and traffic safety. The huge high-pressure trapped air mass inside the deep tunnel drainage system may also further aggravate these problems. In extreme cases, the gas explosion phenomenon may damage the drainage tunnel structure.

[0003] Currently, baffles or partitions are often added to the walls of deep drainage tunnels to reduce the cross-sectional area of ​​the deep tunnel drainage system, thereby reducing its flow capacity. For example, Chinese invention patent CN110094231A discloses a structure for preventing and reducing the harm of stagnant air masses in deep storage tunnels; CN108316446A discloses a structure for changing the location and time of stagnant air masses discharged from urban deep tunnels; CN108316940A discloses a pipe-inlet shaft connection structure for mitigating the discharge of stagnant air masses from deep tunnels; and CN108317331A discloses a... The aforementioned patents describe pipe wall structures designed to mitigate the intense exhaust of air from vertical shafts in deep urban tunnels under full-flow conditions. These structures typically involve adding baffles or partitions to the tunnel walls to disrupt high-pressure trapped air masses. However, this reduces the cross-sectional area of ​​the deep tunnel drainage system, hindering its efficient operation. Furthermore, the effectiveness in disrupting high-pressure trapped air masses is limited; for large-volume trapped air masses, it's difficult to fundamentally eliminate their presence. Additionally, impurities such as branches and leaves in rainwater and sewage can easily clog these wall baffles and partitions, further reducing the system's ability to mitigate the release of high-pressure trapped air masses. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure relief pipe structure for dispersing high-pressure trapped air masses in deep tunnels. This structure can disperse high-pressure trapped air masses in deep tunnel drainage systems into several small air masses through step-by-step pressure relief and energy dissipation without affecting the flow cross-section of the deep tunnel drainage system, thereby preventing gas explosions in the deep tunnel drainage system.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A pressure relief pipeline structure for dispersing high-pressure intercepted air masses in deep tunnels includes multiple pressure relief pipelines connected to a deep drainage tunnel. The pressure relief pipelines are located at the top of the deep drainage tunnel and extend along the axial direction of the deep drainage tunnel. The multiple pressure relief pipelines are arranged sequentially and alternately on the deep drainage tunnel, and the ends of two adjacent pressure relief pipelines intersect each other in the horizontal direction.

[0007] In one embodiment, multiple pressure relief pipelines are arranged alternately on both sides of the longitudinal section of the deep drainage tunnel.

[0008] In one embodiment, the deep drainage tunnel is provided with five pressure relief pipelines arranged in a staggered manner, and the five pressure relief pipelines are respectively symmetrically arranged on both sides of the longitudinal section of the deep drainage tunnel.

[0009] In one embodiment, the pressure relief pipeline includes a straight pressure relief pipe section and arc-shaped connecting pipe sections located at both ends of the straight pressure relief pipe section, the arc-shaped connecting pipe sections being connected to the deep drainage tunnel.

[0010] In one embodiment, the diameter of the pressure relief pipeline is 1 / 10 to 3 / 20 of the diameter of the deep drainage tunnel.

[0011] In one embodiment, the horizontal spacing between the ends of two adjacent pressure relief lines is 3 to 4 times the diameter of the pressure relief line.

[0012] In one embodiment, the length of the pressure relief pipeline is 3 to 5 times the diameter of the deep drainage tunnel.

[0013] In one embodiment, the distance between the center of the pressure relief pipeline and the outer wall of the deep drainage tunnel is 2 to 3 times the diameter of the pressure relief pipeline.

[0014] In one embodiment, the centerlines of two adjacent pressure relief pipelines intersect in the lateral projection to form an angle of 30°, and the intersection of this angle is located on the centerline of the deep drainage tunnel.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) By setting up a pressure relief pipeline at the top of the deep tunnel, the original flow capacity of the deep tunnel drainage system is guaranteed. By releasing pressure step by step through the pressure relief pipeline, the high-pressure intercepted air mass in the deep tunnel drainage system is dispersed into several small air masses, avoiding the occurrence of gas explosion in the deep tunnel drainage system, improving the safety of the deep tunnel drainage system under extreme rainfall conditions, and making it less prone to being blocked by impurities such as leaves and branches. The system is highly systematic, reliable and safe. Attached Figure Description

[0017] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0018] Figure 1 A schematic diagram of an embodiment of the present invention is shown;

[0019] Figure 2 A longitudinal section view of the pressure relief pipeline structure of the present invention is shown;

[0020] Figure 3 A cross-sectional view of the pressure relief pipeline structure of the present invention is shown;

[0021] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0022] Figure label:

[0023] 1-Deep drainage tunnel, 2-Upstream of deep tunnel, 3-Downstream of deep tunnel, 4-High-pressure interception gas mass, 5-Pressure relief pipeline, 51-Left side sub-pipeline, 52-Right side sub-pipeline. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] This invention provides a pressure relief pipe structure for dispersing high-pressure trapped gas masses 4 in deep tunnels, such as... Figure 1 As shown, it includes multiple pressure relief pipes 5 connected to the deep drainage tunnel 1. The pressure relief pipes 5 are located at the top of the deep drainage tunnel 1. The pressure relief pipes 5 all extend along the axial direction of the deep drainage tunnel 1. The multiple pressure relief pipes 5 are arranged sequentially and alternately on the deep drainage tunnel 1, and the ends of two adjacent pressure relief pipes 5 cross each other in the horizontal direction.

[0026] Specifically, multiple pressure relief pipes 5 are arranged alternately on both sides of the longitudinal section of the deep drainage tunnel 1. Each pressure relief pipe 5 includes a pressure relief straight pipe section and an arc-shaped connecting pipe section located at both ends of the pressure relief straight pipe section. The arc-shaped connecting pipe section is connected to the deep drainage tunnel 1.

[0027] It should be noted that in this embodiment, the high-pressure interception air mass 4 formed in the deep tunnel drainage system moves with the water flow to the pressure relief pipe structure. Under the action of pressure, it passes through all the pressure relief pipes 5 in sequence, dispersing the high-pressure interception air mass 4 into several small air masses, thereby achieving the effect of pressure relief, ensuring the safe and stable operation of the deep tunnel drainage system, and at the same time ensuring the original flow capacity of the deep tunnel drainage system.

[0028] Specifically, such as Figures 1 to 3As shown, the multiple pressure relief pipes 5 installed on the deep drainage tunnel 1 include three left sub-pipes 51 and two right sub-pipes 52. The left sub-pipes 51 and right sub-pipes 52 are symmetrically arranged on both sides of the longitudinal section of the deep drainage tunnel 1. The two adjacent left sub-pipes 51 and right sub-pipes 52 intersect each other in the horizontal direction. When the high-pressure interception air mass 4 formed in the tunnel drainage system moves with the water flow to the pressure relief pipe structure provided in this embodiment, it enters the first left sub-pipe 51 under pressure, then enters the deep drainage tunnel 1 and then enters the first right sub-pipe 52. This process continues until the high-pressure interception air mass 4 is dispersed into several small air masses through the pressure relief pipes 5, thereby achieving the pressure relief effect and ensuring the safe and stable operation of the deep tunnel drainage system.

[0029] In one embodiment, the diameter of the pressure relief pipe 5 is 1 / 10 to 3 / 20 of the diameter of the deep drainage tunnel 1, the horizontal intersection distance between the ends of two adjacent pressure relief pipes 5 is 3 to 4 times the diameter of the pressure relief pipe 5, the length of the pressure relief pipe 5 is 3 to 5 times the diameter of the deep drainage tunnel 1, the distance between the center of the pressure relief pipe 5 and the outer wall of the deep drainage tunnel 1 is 2 to 3 times the diameter of the pressure relief pipe 5, and the center lines of two adjacent pressure relief pipes 5 intersect in the horizontal projection to form an angle of 30°, and the intersection point of this angle is located on the center line of the deep drainage tunnel 1.

[0030] That is, Figure 2 and Figure 3 As shown,

[0031] d = 0.1~0.15D;

[0032] L = 3~5D;

[0033] h = 2-3d;

[0034] δ = 3-4d;

[0035] Where D is the diameter of the deep drainage tunnel 1, d is the diameter of the pressure relief pipe 5, L is the length of the pressure relief pipe 5, h is the height between the center of the pressure relief pipe 5 and the outer wall of the deep drainage tunnel 1, and δ is the intersection distance between two adjacent pressure relief pipes 5.

[0036] Under conditions of heavy rainfall, gas that is not discharged in time within the deep drainage tunnel 1 is trapped, forming a high-pressure trapped gas cloud 4. This high-pressure trapped gas cloud 4 moves with the water flow from the upstream 2 to the downstream 3 of the deep tunnel. When the high-pressure trapped gas cloud 4 reaches the inlet of the left sub-pipeline 51, a portion of it, under pressure, rapidly enters the left sub-pipeline 51 and exits from its outlet. Subsequently, a portion of the high-pressure trapped gas cloud 4 enters the front end of the right sub-pipeline 52. The gas enters from the inlet and exits from the rear outlet of the right sub-pipe 52. It passes through multiple pressure relief pipes 5 in sequence, gradually dispersing the high-pressure intercepted gas mass 4 upstream of the deep tunnel into several small-volume gas masses, and the pressure also decreases accordingly. When a high-pressure intercepted gas mass 4 is formed downstream of the deep tunnel, the buoyancy can also be used to make the high-pressure intercepted gas mass 4 pass through the pressure relief pipe structure and disperse it into several low-pressure small-volume gas masses, thereby eliminating the harm of the high-pressure intercepted gas mass 4 to the deep tunnel structure and ensuring the safe and stable operation of the deep tunnel drainage system.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A pressure relief pipe structure for dispersing high-pressure trapped gas masses in deep tunnels, characterized in that, The system includes multiple pressure relief pipes connected to a deep drainage tunnel. These pressure relief pipes are located at the top of the deep drainage tunnel and extend along its axial direction. They are arranged sequentially and alternately on the tunnel, with the ends of adjacent pipes intersecting horizontally. The pipes are also arranged alternately on both sides of the tunnel's longitudinal section. Five sequentially and alternately arranged pressure relief pipes are symmetrically positioned on both sides of the tunnel's longitudinal section. Each pressure relief pipe includes a straight pressure relief section and arc-shaped connecting sections at both ends of the straight section. The arc-shaped connecting sections are connected to the tunnel. The diameter of each pressure relief pipe is 1 / 10 to 3 / 20 of the tunnel's diameter.

2. The pressure relief pipeline structure for dispersing high-pressure trapped gas masses in deep tunnels according to claim 1, characterized in that, The horizontal spacing between the ends of two adjacent pressure relief pipes is 3 to 4 times the diameter of the pressure relief pipe.

3. The pressure relief pipeline structure for dispersing high-pressure trapped gas masses in deep tunnels according to claim 1, characterized in that, The length of the pressure relief pipeline is 3 to 5 times the diameter of the deep drainage tunnel.

4. A pressure relief pipeline structure for dispersing high-pressure trapped gas masses in deep tunnels according to claim 1, characterized in that, The distance between the center of the pressure relief pipeline and the outer wall of the deep drainage tunnel is 2 to 3 times the diameter of the pressure relief pipeline.

5. A pressure relief pipeline structure for dispersing high-pressure trapped gas masses in deep tunnels according to claim 1, characterized in that, The centerlines of two adjacent pressure relief pipelines intersect in the lateral projection to form an angle of 30°, and the intersection of this angle is located on the centerline of the deep drainage tunnel.

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