Automatic blowout-preventing shield screw conveyor

Abstract

The utility model discloses a shield screw conveyor of automatic anti -spouting, belongs to shield screw conveyor technical field, including screw machine, the side of screw machine is provided with pressure relief pipe, and the inner chamber of pressure relief pipe is equipped with filter equipment, and the end of pressure relief pipe is provided with first L shape elbow pipe. In the utility model, the side of screw machine on the earth bunker is provided with pressure relief pipe, and the end of pressure relief pipe is provided with first L shape elbow pipe, first pneumatic ball valve, manual ball valve, straight pipe, steel wire hose and first L shape elbow pipe, when spouting in the shield process is detected certain water pressure by water pressure sensor, closes switch valve, opens first pneumatic ball valve, makes the water in screw machine from pressure relief pipe, first L shape elbow pipe, first pneumatic ball valve, manual ball valve, straight pipe, steel wire hose and first L shape elbow pipe and is collected in the liquid storage tank, and the pressure in screw machine is unloaded, guarantees that screw machine successfully discharges residue, avoids the spouting of screw machine residue discharge port.

Description

Technical Field

[0001] This utility model relates to the field of shield tunnel screw conveyor technology, and more specifically, to an automatic anti-gushing shield tunnel screw conveyor. Background Technology

[0002] With the widespread adoption of subway construction in various cities, the number of water-rich strata encountered during construction is also increasing.

[0003] During tunnel boring machine (TBM) excavation, the screw conveyor may encounter water-rich strata, leading to a blowout phenomenon. The blowout mud and sand leaks to the tail of the shield and the connecting bridge, significantly impacting on-site procedures and output due to reduced cleaning and tunneling time. Water sources are typically divided into front and rear sources, thus requiring suppression or prevention of blowouts during TBM excavation. There are three main methods to suppress blowouts during TBM excavation: The first is injecting a modifier: typically, a high-molecular-weight polymer is injected into the injection hole at the bottom of the screw conveyor. The principle of this polymer is to polymerize mud and water molecules. However, in hard rock strata with low or no mud content, the polymer is generally ineffective, and blowouts will still occur. The second method is injecting a water-stop ring: a double-liquid grout is injected into the three rings behind the tail of the shield. In one ring, except for the K-block, all other segment holes are injected with the double-liquid grout, for 2-3 injections. One method involves ring-shaped, staggered injection to achieve a good water-stopping effect, preventing water from the rear from flowing into the soil chamber. However, this method only stops water from the rear; it is ineffective if there is a large water source at the front of the stratum. A third method involves improving the tunneling method: generally, pneumatic tunneling uses high air pressure to hold water back from flowing into the soil chamber, thus achieving a water-stopping effect. However, if the stratum is hard and the water pressure is high, pneumatic tunneling not only fails to suppress the gushing but may even increase the occurrence of gushing, leading to a vicious cycle. Another method is full-soil tunneling, which fills the soil chamber with solid soil, allowing external water to flow in due to the lack of gaps in the solid soil, thereby suppressing gushing. However, this method increases thrust, cutterhead torque, cutter wear rate, and tunneling speed, and it also fails to achieve a particularly ideal effect. Therefore, we propose an automatic anti-gushing shield screw conveyor. Utility Model Content

[0004] In view of the problems mentioned in the background art above, the purpose of this utility model is to provide an automatic anti-gushing shield screw conveyor.

[0005] To solve the above problems, this utility model adopts the following technical solution: an automatic anti-surge shield screw conveyor, including a screw conveyor, a pressure relief pipe is provided on the side of the screw conveyor, a filter mechanism is sleeved in the inner cavity of the pressure relief pipe, a first L-shaped bend is provided at the end of the pressure relief pipe, a first pneumatic ball valve is provided at the end of the first L-shaped bend, a manual ball valve is provided at the end of the first pneumatic ball valve, a straight pipe is provided at the end of the manual ball valve, a steel wire hose is sleeved on the outside of the straight pipe, a second L-shaped bend is sleeved at the end of the steel wire hose, a liquid storage tank is fixedly sleeved at the end of the second L-shaped bend, a liquid level sensor is provided on the liquid storage tank, a first water pump is fixedly installed on the side of the liquid storage tank, one end of the first water pump extends into the inner cavity of the liquid storage tank, the other end of the first water pump is fixedly connected to a drain pipe, a backflushing mechanism is provided between the liquid storage tank and the first L-shaped bend, a limit ring is provided at one end of the inner cavity of the pressure relief pipe, and a water pressure sensor is fixedly installed on the inner wall of the first L-shaped bend.

[0006] As a preferred embodiment of the present invention, the filtering mechanism includes a filter ring sleeved in the inner cavity of the pressure relief pipe, the inner cavity of the filter ring is provided with a grid, one end of the filter ring is in contact with a limiting ring, and the other end of the filter ring is in contact with the end of the first L-shaped bend.

[0007] As a preferred embodiment of the present invention, the backflushing mechanism includes a second water pump fixedly installed on the side of the storage tank, the input end of the second water pump extending into the inner cavity of the storage tank, the output end of the second water pump being fixedly connected to a backflushing hose, the end of the backflushing hose being fixedly connected to a second pneumatic ball valve, and the end of the second pneumatic ball valve being fixedly sleeved into the inner cavity of the first L-shaped bend.

[0008] As a preferred embodiment of this utility model, the ends of the pressure relief pipe, the first L-shaped bend, the first pneumatic ball valve, the manual ball valve, the straight pipe, the second pneumatic ball valve, and the backflush hose are all fixedly fitted with flanges, and each pair of adjacent flanges are connected by bolts.

[0009] As a preferred embodiment of this utility model, pipe clamps are respectively fitted at both ends of the steel wire hose, and the two pipe clamps are respectively located on the outside of the straight pipe and the second L-shaped bend.

[0010] As a preferred embodiment of this utility model, a switching valve is provided at the lower part of the top of the screw conveyor.

[0011] As a preferred embodiment of this utility model, the screw conveyor is provided with a screw conveying mechanism.

[0012] The advantages of this utility model are: (1) In this utility model, a pressure relief pipe is set on the side of the soil chamber of the screw conveyor, and a first L-shaped bend, a first pneumatic ball valve, a manual ball valve, a straight pipe, a steel wire hose and a first L-shaped bend are set at the end of the pressure relief pipe. When a surge occurs during the shield tunneling process and a certain water pressure is detected by the water pressure sensor, the switch valve is closed and the first pneumatic ball valve is opened, so that the water in the screw conveyor is introduced from the pressure relief pipe, the first L-shaped bend, the first pneumatic ball valve, the manual ball valve, the straight pipe, the steel wire hose and the first L-shaped bend into the liquid storage tank for collection, so as to relieve the pressure in the screw conveyor, ensure that the screw conveyor discharges slag smoothly, and avoid the slag discharge port of the screw conveyor from surging.

[0013] (2) In this utility model, by using the pressure relief pipe, the limiting ring, the filter ring and the grid together, when water is discharged from the pressure relief pipe, the grid is used to block the larger stones or rocks to prevent them from blocking the pipeline. When the pressure is released, the second water pump is started at regular intervals to draw out the water in the storage tank, and the second pneumatic ball valve is opened and the first pneumatic ball valve is closed, so that the water in the storage tank is introduced into the first L-shaped bend through the backwash hose, and the water in the first L-shaped bend is used to backwash the grid to prevent it from being blocked. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is an exploded view of the overall structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the pressure relief pipe of this utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the steel wire hose of this utility model.

[0018] Figure 5 This is a schematic diagram of the structure of the filter ring of this utility model.

[0019] Figure 6 This is a schematic diagram of the structure of the first L-shaped bend of this utility model.

[0020] Figure 7 This is a cross-sectional schematic diagram of the liquid storage tank of this utility model.

[0021] The following are the labels in the diagram: 1. Screw compressor; 2. Pressure relief pipe; 3. Filter mechanism; 4. First L-shaped bend; 5. First pneumatic ball valve; 6. Manual ball valve; 7. Straight pipe; 8. Steel wire hose; 9. Second L-shaped bend; 10. Limiting ring; 11. Filter ring; 12. Grille; 13. Flange; 14. Pipe clamp; 15. Switch valve; 16. Backflushing mechanism; 17. Liquid storage tank; 18. Liquid level sensor; 19. First water pump; 20. Drain pipe; 21. Second water pump; 22. Backflushing hose; 23. Second pneumatic ball valve; 24. Water pressure sensor. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example 1

[0025] like Figures 1 to 7As shown, an automatic anti-surge shield screw conveyor includes a screw conveyor 1. A pressure relief pipe 2 is provided on the side of the screw conveyor 1. A filter mechanism 3 is fitted inside the pressure relief pipe 2. A first L-shaped bend 4 is provided at the end of the pressure relief pipe 2. A first pneumatic ball valve 5 is provided at the end of the first L-shaped bend 4. A manual ball valve 6 is provided at the end of the first pneumatic ball valve 5. A straight pipe 7 is provided at the end of the manual ball valve 6. A steel wire hose 8 is fitted outside the straight pipe 7. A second L-shaped bend 9 is fitted at the end of the steel wire hose 8. A liquid storage tank 17 is fixedly connected to the end of the second L-shaped bend 9. A liquid level sensor 18 is provided on the liquid storage tank 17. A first water pump 19 is fixedly installed on the side of the liquid storage tank 17. One end of the first water pump 19 extends into the inner cavity of the liquid storage tank 17, and the other end of the first water pump 19 is fixedly connected to a drain pipe 20. A backflushing mechanism 16 is provided between the first L-shaped bend 4 and the pressure relief pipe 2. A limit ring 10 is provided at one end of the inner cavity of the pressure relief pipe 2. A water pressure sensor 24 is fixedly installed on the inner wall of the first L-shaped bend 4. Pipe clamps 14 are respectively fitted on both ends of the steel wire hose 8. The two pipe clamps 14 are located on the outside of the straight pipe 7 and the second L-shaped bend 9, respectively. A switch valve 15 is provided at the lower part of the top of the screw conveyor 1. The switch valve 15 is used to discharge the soil conveyed in the screw conveyor 1, so that the soil falls onto the conveyor belt. The first pneumatic ball valve 5 is driven by the compressor equipment on the shield machine and is connected to the first pneumatic ball valve 5 by an air pipe. The shield machine operator is responsible for opening and closing the first pneumatic ball valve 5. Example 2

[0026] Based on Example 1, such as Figures 1 to 7As shown, the filtration mechanism 3 includes a filter ring 11 fitted inside the pressure relief pipe 2. The filter ring 11 has a grid 12 inside its cavity, with small pores allowing only water and fine sand particles to drain. One end of the filter ring 11 contacts a limiting ring 10, and the other end contacts the end of a first L-shaped bend 4. The inner diameter of the first L-shaped bend 4 is equal to the inner diameters of the limiting ring 10 and the filter ring 11, ensuring smooth water flow and discharge. Additionally, the limiting ring 10 and the first L-shaped bend 4 limit the filter ring 11 located inside the pressure relief pipe 2, ensuring that the filter ring 11 is installed within the pressure relief pipe 2. The backflushing mechanism 16 includes a second water pump 21 fixedly installed on the side of the storage tank 17. The input end of the second water pump 21 extends into the inner cavity of the storage tank 17, and the output end of the second water pump 21 is fixedly connected to a backflushing hose 22. The end of the first L-shaped bend 4 is fixedly connected to a second pneumatic ball valve 23. The end of the second pneumatic ball valve 23 is fixedly sleeved into the inner cavity of the first L-shaped bend 4. The straight pipe 7, the steel wire hose 8, and the second L-shaped bend 9 are fixed along the welded pipe frame above the main beam of the connecting bridge to avoid affecting the guiding system. The second pneumatic ball valve 23 and the first pneumatic ball valve 5 are driven by the compressor equipment on the shield machine and are connected to the first pneumatic ball valve 5 and the second pneumatic ball valve 23 by air pipes. They are controlled by the shield machine operator. In addition, the second water pump 21, the first water pump 19, the liquid level sensor 18, and the water pressure sensor 24 are all connected to the shield machine controller through wires for control. Example 3

[0027] Based on Embodiment 1 and Embodiment 2, such as Figures 1 to 6 As shown, the ends of the pressure relief pipe 2, the first L-shaped bend 4, the first pneumatic ball valve 5, the manual ball valve 6, the straight pipe 7, the second pneumatic ball valve 23, and the backflush hose 22 are all fixedly fitted with flanges 13. Each pair of adjacent flanges 13 are connected by bolts. The bolt assembly is existing technology and consists of bolts, nuts, and spring washers.

[0028] It should be noted that this utility model is an automatic anti-gushing shield screw conveyor. Before the excavation begins, the switch valve 15 below the soil chamber on the screw conveyor 1 is closed. When water gushing from the screw conveyor 1 enters the first L-shaped bend 4, the water flow is controlled by the water pressure sensor 24. When the water pressure sensor 24 detects the water pressure of the gushing water, i.e., when the gushing phenomenon occurs, the manual ball valve 6 is in the normally open state, controlling the first pneumatic ball valve 5 to open. The water is then guided into the storage tank 17 for collection through the pressure relief pipe 2, the first L-shaped bend 4, the first pneumatic ball valve 5, the manual ball valve 6, the straight pipe 7, the steel wire hose 8, and the second L-shaped bend 9, thus realizing the function of depressurizing the soil chamber on the screw conveyor 1. At the same time, the water level sensor 18 in the storage tank 17 is used to control the water volume. When the water volume is large, the first water pump 19 is started to drain the water in the storage tank 17 through the drain pipe 20. The water is introduced into the dump truck for operation. In addition, when the water in the screw conveyor 1 is discharged from the pressure relief pipe 2, the grid 12 on the inner side of the filter ring 11 in the inner cavity of the pressure relief pipe 2 is used to block large stones or rocks, so as to avoid clogging the pressure relief pipe. When the water pressure sensor 24 detects that the water pressure has dropped to a certain level, the switch valve 15 is opened and the slag is discharged normally onto the conveyor belt. In this way, the screw conveyor 1 will not gushing. After the pressure is released, a secondary grouting process of injecting water-stop rings can be carried out to block the water source at the rear and further prevent the gushing phenomenon. The water-stop ring injection step is existing technology. In addition, the second water pump 21 is started at regular intervals to draw water out of the storage tank 17, and the second pneumatic ball valve 23 is opened while the first pneumatic ball valve 5 is closed. This allows the water in the storage tank 17 to be introduced into the first L-shaped bend 4 through the backflushing hose 22. The water in the first L-shaped bend 4 is then used to backflush the grid 12 to prevent it from becoming clogged. If backflushing fails to clear the blockage, the first L-shaped bend 4 is removed from the pressure relief pipe 2 so that the filter ring 11 can be taken out for cleaning.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. An automatic anti-surge shield screw conveyor, comprising a screw conveyor (1), characterized in that: The screw conveyor (1) is provided with a pressure relief pipe (2) on its side. A filter mechanism (3) is sleeved inside the pressure relief pipe (2). A first L-shaped bend (4) is provided at the end of the pressure relief pipe (2). A first pneumatic ball valve (5) is provided at the end of the L-shaped bend (4), a manual ball valve (6) is provided at the end of the first pneumatic ball valve (5), a straight pipe (7) is provided at the end of the manual ball valve (6), a steel wire hose (8) is sleeved on the outside of the straight pipe (7), a second L-shaped bend (9) is sleeved at the end of the steel wire hose (8), a liquid storage tank (17) is fixedly sleeved at the end of the second L-shaped bend (9), a liquid level sensor (18) is provided on the liquid storage tank (17), a first water pump (19) is fixedly installed on the side of the liquid storage tank (17), one end of the first water pump (19) extends into the inner cavity of the liquid storage tank (17), and the other end of the first water pump (19) is fixedly connected to a drain pipe (20). A backflushing mechanism (16) is provided between the liquid storage tank (17) and the first L-shaped bend (4), and a limit ring (10) is provided at one end of the inner cavity of the pressure relief pipe (2). A water pressure sensor (24) is fixedly installed on the inner wall of the bend (4).

2. The automatic anti-gushing shield screw conveyor according to claim 1, characterized in that: The filter mechanism (3) includes a filter ring (11) sleeved in the inner cavity of the pressure relief pipe (2). The inner cavity of the filter ring (11) is provided with a grid (12). One end of the filter ring (11) is in contact with the limiting ring (10), and the other end of the filter ring (11) is in contact with the end of the first L-shaped bend (4).

3. The automatic anti-gushing shield screw conveyor according to claim 2, characterized in that: The backflushing mechanism (16) includes a second water pump (21) fixedly installed on the side of the storage tank (17). The input end of the second water pump (21) extends into the inner cavity of the storage tank (17). The output end of the second water pump (21) is fixedly connected to a backflushing hose (22). The end of the backflushing hose (22) is fixedly connected to a second pneumatic ball valve (23). The end of the second pneumatic ball valve (23) is fixedly sleeved into the inner cavity of the first L-shaped bend (4).

4. The automatic anti-gushing shield screw conveyor according to claim 3, characterized in that: The ends of the pressure relief pipe (2), the first L-shaped bend (4), the first pneumatic ball valve (5), the manual ball valve (6), the straight pipe (7), the second pneumatic ball valve (23), and the backflush hose (22) are all fixedly fitted with flanges (13), and each pair of adjacent flanges (13) are connected by bolts.

5. The automatic anti-gushing shield screw conveyor according to claim 1, characterized in that: The two ends of the steel wire hose (8) are respectively fitted with pipe clamps (14), and the two pipe clamps (14) are located on the outside of the straight pipe (7) and the second L-shaped bend (9).

6. The automatic anti-gushing shield screw conveyor according to claim 1, characterized in that: A switching valve (15) is provided at the lower part of the top of the screw (1).

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