A harmful gas collection device for mud-water shield

Abstract

The present invention proposes a harmful gas collection device for a slurry shield, wherein a gas guide device is arranged on the top of the front middle shield of the shield machine, the gas guide device is respectively connected to the slurry bin and the air cushion bin in the shield machine, and the gas guide device is connected to the upper part of the gas collecting device, the upper part of the gas collecting device is connected to the transfer device, the lower part of the gas collecting device is connected to the main slurry discharge pipe, and the gas collecting device is connected to the control system. The present invention can collect harmful gases in the stratum excavated by the shield in time, and then transport them outside the tunnel for treatment, greatly reducing the content of harmful gases in the construction tunnel, improving the safety of the slurry shield in the construction of strata rich in harmful gases, and the overall device is easy to install and simple to operate, and has a good prospect for promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of harmful gas treatment in a shield, and in particular to a harmful gas collection and treatment device for a slurry shield. Background Art

[0002] With the development of shield construction technology, more and more tunnel projects are excavated by shield machines. However, in the geological survey of some tunnel projects, it was found that there were a large number of harmful gases in the strata, mainly methane and carbon monoxide. According to the requirements of the "Technical Specifications for Railway Gas Tunnels", methane concentrations less than 0.3% and carbon monoxide concentrations less than 30PPM are considered safe; methane concentrations greater than 5% can cause explosions, and carbon monoxide concentrations reaching 200PPM can endanger personal safety. The presence of harmful gases brings many safety hazards to the construction of shield machines, because tunnel construction generally has poor air circulation. At present, tunnel construction mainly uses strong ventilation, multiple detection and other means to dilute harmful gases and reduce safety risks; however, harmful gases still exist in the excavated tunnels, and safety hazards still exist. Summary of the invention

[0003] In view of the fact that strong ventilation, multiple detection and other means are used to treat harmful gases in tunnel construction, the complicated technical problem of the overall exhaust equipment makes the treatment effect of harmful gases in the tunnel unsatisfactory. The present invention proposes a slurry shield harmful gas collection and treatment device.

[0004] In order to solve the above problems, the technical solution of the present invention is achieved as follows:

[0005] A harmful gas collection device for a slurry shield, an air guide device is arranged on the top of the front middle shield of the shield machine, the air guide device is respectively connected with the slurry bin and the air cushion bin in the shield machine, and the air guide device is connected with the upper part of the air collecting device, the upper part of the air collecting device is connected with the transfer device, the lower part of the air collecting device is connected with the main slurry discharge pipe, the main slurry discharge pipe is connected with the lower part of the air cushion bin, and the air collecting device is connected with a control system.

[0006] Preferably, the air guide device includes two groups of air guide pipes, the two groups of air guide pipes are connected, the two groups of air guide pipes are connected to the mud and water bin and the air cushion bin respectively, and the two groups of air guide pipes are connected to the air collecting device.

[0007] Preferably, both groups of air guide tubes are provided with ventilation valves.

[0008] Preferably, the gas collecting device is arranged on a trailer.

[0009] Preferably, the gas collecting device includes a gas collecting tank, which is arranged on a trailer. The upper part of the gas collecting tank is connected to two groups of gas guide pipes in the gas guide device through an air inlet valve, the upper part of the gas collecting tank is connected to a transfer device, and the lower part of the gas collecting tank is connected to a main slurry discharge pipe; a liquid level detection device, a first pressure detection device and a harmful gas concentration detection device are provided on the gas collecting tank, and a second pressure detection device is provided in the gas collecting tank. The air inlet valve, the liquid level detection device, the second pressure detection device and the harmful gas concentration detection device are all connected to the control system.

[0010] Preferably, the gas collecting tank is connected to the main slurry discharge pipe through a slurry discharge branch pipe, a slurry discharge valve is provided on the slurry discharge branch pipe, and the slurry discharge valve is connected to the upper computer in the control system; the gas collecting tank is connected to the transfer device through a gas compression device.

[0011] Preferably, the liquid level detection device includes a liquid level detector, the first pressure detection device includes a pressure detection gauge, the second pressure detection device includes a pressure sensor, and the harmful gas concentration detection device includes a harmful gas concentration detector, and the liquid level detector, pressure sensor and harmful gas concentration detector are all connected to the host computer in the control system.

[0012] Preferably, the number of the liquid level detectors provided is at least two groups and the two groups of liquid level detectors are respectively located at different heights on the gas collection tank.

[0013] Preferably, the transfer device comprises a transfer vehicle, on which a gas storage tank is provided, and the gas storage tank is connected to the gas collecting tank via a gas compression device; and a pressure detector is provided on the gas storage tank.

[0014] The beneficial effects of the present invention are as follows: the present invention is combined with a control system to process the detection information of the harmful gas detection device on the gas collecting tank in real time, so that the harmful gas in the shield excavation stratum can be collected and processed in time, and then transported to the outside of the tunnel for processing, which greatly reduces the content of harmful gases in the construction tunnel and improves the safety of slurry shield construction in strata rich in harmful gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the central gas guide device.

[0018] Figure 3 for Figure 1 Schematic diagram of the structure of the gas collecting device.

[0019] Figure 4 for Figure 1 Schematic diagram of the structure of the transfer device.

[0020] In the figure, 1 is a gas guide device, 2 is a gas collecting device, 3 is a transfer device, 4 is a ventilation valve, 5 is a liquid level detector, 6 is a gas collecting tank, 7 is a pressure detection gauge, 8 is a harmful gas concentration detector, 9 is a pressure sensor, 10 is a gas compression device, 11 is a gas storage tank, and 12 is a main slurry discharge pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, a slurry shield harmful gas collection device can be used in large-diameter slurry shields (diameter over 10 meters) and conventional slurry shields (diameter about 6 meters). The structure is simple. An air guide device 1 is set on the top of the front middle shield of the shield machine. The air guide device 1 is respectively connected to the slurry bin and the air cushion bin in the shield machine, and the air guide device 1 is connected to the gas collection device 2. This is mainly because the density of methane and carbon monoxide is smaller than that of air, which is conducive to the discharge of harmful gases. When the slurry shield is excavating normally, there is more or less gas on the top of the slurry bin, and most of the rest is filled with mud; Figure 2 As shown, the air guide device 1 includes two groups of air guide pipes, and the two groups of air guide pipes are connected. The two groups of air guide pipes are respectively connected to the mud and water bin and the air cushion bin, and the two groups of air guide pipes are connected to the upper part of the gas collecting device 2. The air guide pipes connect the excavation bin and the air cushion bin. Harmful gases in either bin can be collected and then processed. Vent valves 4 are provided on the two groups of air guide pipes. Vent valves 4 are manual valves, which can facilitate the staff to switch the pipeline connectivity and facilitate operation.

[0023] The main functions of the air guide pipe are as follows: 1. To discharge the gas on the top of the mud and water bin, so that the mud and water bin is filled with mud as much as possible to meet the requirements of shield tunneling construction. If there is no harmful gas in this part of the gas, it can also be discharged into the air cushion bin; 2. If construction is carried out in a stratum rich in harmful gases for a long time, in order to prevent a large amount of harmful gases from existing in the air cushion bin, the air can also be replenished to the air cushion bin through the SAMSON system, and the gas in the air cushion bin can be replaced by exhausting the gas outward through the air guide pipe, thereby reducing the concentration of harmful gases.

[0024] like Figure 3 As shown, the upper part of the gas collecting device 2 is connected to the transfer device 3, the lower part of the gas collecting device 2 is connected to the main slurry discharge pipe 12, the main slurry discharge pipe 12 is connected to the lower part of the mud and water bin, the gas collecting device 2 is arranged at a suitable position of the trailer, the gas collecting device 2 is connected to the control system, the gas collecting device 2 includes a gas collecting tank 6, the gas collecting tank 6 is arranged on the trailer, the gas collecting tank 6 is connected to the two groups of gas guide pipes in the gas guide device 1 through the air inlet valve, the gas collecting tank 6 is respectively connected to the main slurry discharge pipe 12 and the transfer device 3; the gas collecting tank 6 is provided with a liquid level detection device, a first pressure detection device and a harmful gas concentration detection device, and a second pressure detection device is provided in the gas collecting tank, the air inlet valve, the liquid level detection device, the second pressure detection device, The detection device and the harmful gas concentration detection device are both connected to the control system. The liquid level detection device includes a liquid level detector 5, the first pressure detection device includes a pressure detection gauge 7, the second pressure detection device includes a pressure sensor 9, and the harmful gas concentration detection device includes a harmful gas concentration detector 8. If the gas in the formation enters the excavation bin, but the harmful gas concentration detector of the gas collecting tank determines that the gas is not a harmful gas, the gas can be discharged into the air cushion bin through the gas pipeline and used as the air cushion bin pressure-maintaining gas to detect the harmful gas concentration inside the gas collecting tank. The liquid level detector 5, pressure sensor 9 and harmful gas concentration detector 8 are all connected to the host computer in the control system.

[0025] After the staff opens the vent valve, the harmful gas is discharged into the gas collecting tank 6 through the air duct. While collecting the harmful gas, if the mud in the mud and water bin is too full, some of the mud will enter the gas collecting tank 6 and exist at its bottom, and the upper part is harmful gas. The number of the liquid level detectors 5 is at least two groups, and the two groups of liquid level detectors 5 are respectively set at different heights on the gas collecting tank, and there are liquid level detections at different positions. If the liquid level is found to be rising all the time, it can be judged that there is no gas in the mud and water bin, and gas collection can be stopped. The gas collecting tank is also provided with a pressure detection gauge and a pressure sensor. If the pressure reaches the set value, the air inlet valve can be closed by the upper computer in the control system to stop the harmful gas from entering the gas collecting tank.

[0026] The gas collecting tank 6 is connected to the main slurry discharge pipe 12 through a slurry discharge branch pipe, and the main slurry discharge pipe is connected to the mud and water bin. A slurry discharge valve is provided on the slurry discharge branch pipe, and the slurry discharge valve is connected to the upper computer in the control system. The mud accumulated at the bottom of the gas collecting tank 6 can be connected to the main slurry discharge pipe through the slurry discharge branch pipe to discharge the mud therein. At this time, it is also necessary to observe the liquid level value on the liquid level detector to control the discharge of the mud through the slurry discharge valve. If mud enters the gas collecting tank, it will gather at the bottom of the gas collecting tank, and the mud level can be automatically checked by the liquid level detector, and the slurry discharge valve at the bottom can be controlled to discharge the slurry, and the mud will be pumped back into the main slurry discharge pipe of the shield machine, which has no effect on the collection and discharge of gas, and is convenient for zero pollution; if the liquid level of the slip bin is reduced, part of the gas can be discharged into the gas collecting tank through the air guide pipe while replenishing mud to the excavation bin.

[0027] like Figure 4 As shown, the gas collecting tank 6 is connected with the transfer device 3 through a gas compression device 10, and the transfer device 3 includes a transfer vehicle, on which a gas storage tank 11 is provided, and the gas storage tank 11 is connected with the gas collecting tank 6 through a gas compression device 10; a pressure detector is provided on the gas storage tank 11, and the pressure detector is used to detect the storage volume in the gas storage tank. The exhaust port on the gas collecting tank 6 can be connected to a gas compression device, and the gas compression device compresses the harmful gas to increase the gas collection volume. The compressed high-pressure harmful gas is discharged into the gas storage device through this device, and the air duct is connected to the gas storage tank 11 on the transfer vehicle for storage. There is no need to arrange pipelines in the tunnel. After reaching a certain storage volume, the harmful gas is transferred to the outside of the tunnel for treatment by a gas storage tank, and the cost is relatively low.

[0028] If there is a small amount of harmful gas that needs to be collected, the staff will first open the ventilation valve and the air guide device to discharge the harmful gas into the gas collection tank until the pressure in the collection device is the same as the pressure at the top of the mud and water bin; then check whether the mud level in the collection device is at the lowest level. If not, open the mud discharge valve to release the mud, and close the valve when the lowest level is reached, try to ensure that as much harmful gas as possible can be collected in the collection device, and finally close the air intake valve. The gas can be temporarily stored in the collection device and transported outside the tunnel at the appropriate time.

[0029] If there is a large amount of harmful gas in the stratum excavated by the shield, it can be compressed into the transfer device through multiple collection and compression of harmful gases. While doing this operation, always pay attention to the pressure changes in the mud and water bin, perform grouting operations in a timely manner, ensure the stability of the internal pressure of the mud and water bin, and finally transfer the collected harmful gas to the outside of the tunnel for treatment.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A harmful gas collection device for a slurry shield, wherein a gas guide device (1) is arranged on the top of the front middle shield of the shield machine, characterized in that: The air guide device (1) is respectively connected to the mud and water bin and the air cushion bin in the shield machine, and the air guide device (1) is connected to the upper part of the air collecting device (2), the upper part of the air collecting device (2) is connected to the transfer device (3), the lower part of the air collecting device (2) is connected to the main slurry discharge pipe (12), the main slurry discharge pipe (12) is connected to the lower part of the air cushion bin, and the air collecting device (2) is connected to the control system; The air guide device (1) comprises two groups of air guide pipes, the two groups of air guide pipes are connected, the two groups of air guide pipes are respectively connected to the mud and water bin and the air cushion bin, and the two groups of air guide pipes are both connected to the air collecting device (2); The gas collecting device (2) is arranged on a trailer; The gas collecting device (2) comprises a gas collecting tank (6), which is arranged on a trailer; the upper part of the gas collecting tank (6) is connected to the two groups of gas guide pipes in the gas guide device (1) through an air inlet valve; the upper part of the gas collecting tank (6) is connected to the transfer device (3); the lower part of the gas collecting tank (6) is connected to the main pulp discharge pipe (12); the gas collecting tank (6) is provided with a liquid level detection device, a first pressure detection device and a harmful gas concentration detection device; the gas collecting tank is provided with a second pressure detection device; the air inlet valve, the liquid level detection device, the second pressure detection device and the harmful gas concentration detection device are all connected to a control system; The gas collecting tank (6) is connected to the main slurry discharge pipe (12) via a slurry discharge branch pipe, a slurry discharge valve is provided on the slurry discharge branch pipe, and the slurry discharge valve is connected to the upper computer in the control system; the gas collecting tank (6) is connected to the transfer device (3) via a gas compression device (10).

2. The harmful gas collection device of the slurry shield according to claim 1 is characterized in that: The two groups of air guide tubes are both provided with ventilation valves (4).

3. The harmful gas collection device of the slurry shield according to claim 1 is characterized in that: The liquid level detection device comprises a liquid level detector (5), the first pressure detection device comprises a pressure detection gauge (7), the second pressure detection device comprises a pressure sensor (9), and the harmful gas concentration detection device comprises a harmful gas concentration detector (8). The liquid level detector (5), the pressure sensor (9) and the harmful gas concentration detector (8) are all connected to a host computer in a control system.

4. The harmful gas collection device of the slurry shield according to claim 3 is characterized in that: The number of the liquid level detectors (5) provided is at least two groups, and the two groups of liquid level detectors (5) are respectively provided at different heights on the gas collecting tank.

5. The harmful gas collection device of the slurry shield according to claim 1 is characterized in that: The transfer device (3) comprises a transfer vehicle, on which a gas storage tank (11) is provided, the gas storage tank (11) being connected to a gas collecting tank (6) via a gas compression device (10); and a pressure detector is provided on the gas storage tank (11).

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