Earth pressure shield tunneling machine

Abstract

The utility model provides an earth pressure shield tunneling machine, and belongs to the technical field of tunneling. The earth pressure shield tunneling machine comprises an earth bin and a sealing cover body used for sealing a belt conveyor, at least one exhaust outlet is formed in the sealing cover body and communicated with an exhaust pipe, the earth pressure shield tunneling machine further comprises an air guide pipe, one end of the air guide pipe is communicated with the earth bin, and the other end of the air guide pipe is communicated with the sealing cover body or the exhaust pipe. The gas guide pipe is additionally arranged to exhaust harmful gas in the soil bin into the closed cover body or the exhaust pipe, the efficiency of exhausting the harmful gas in the soil bin is improved, and the situation that the concentration of the harmful gas in the soil bin is too high when construction is conducted in a stratum with the large content of the harmful gas is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel excavation, in particular to an earth pressure shield machine. Background Art

[0002] During the construction of the earth pressure shield machine, the screw conveyor transports the slag from the soil bin to the rear supporting belt conveyor, and then the rear supporting belt conveyor transports it to the end of the rear supporting. The rear supporting belt conveyor is an open structure. When there are flammable and explosive harmful gases in the excavated stratum, the harmful gases are easy to spread into the tunnel, posing a great safety hazard.

[0003] To solve the above-mentioned technical problems, the Chinese invention patent application with application publication number CN113047856A and application publication date June 29, 2021 discloses an earth pressure shield machine for strata rich in harmful gases, including a cutter head, a shield body, a main drive, an assembler, a screw conveyor and a rear supporting component, the rear supporting component including a rear supporting trailer and a belt conveyor pressure isolation chamber, the front end of the belt conveyor pressure isolation chamber is sealed and connected to the slag outlet of the screw conveyor, and the rear end extends to the tunnel belt conveyor area at the tail of the rear supporting trailer, a shield machine belt conveyor is arranged in the inner cavity of the belt conveyor pressure isolation chamber, the shield machine belt conveyor can transport the slag discharged from the slag outlet of the screw conveyor to the tunnel belt conveyor area, and the belt conveyor pressure isolation chamber is provided with a suction assembly and a ventilation assembly connected to the inner cavity of the belt conveyor pressure isolation chamber, the suction assembly can extract the gas in the inner cavity, and the ventilation assembly can inject fresh air into the inner cavity to dilute the harmful gas.

[0004] The above-mentioned earth pressure shield machine prevents the diffusion of harmful gases by controlling the harmful gases in the pressure isolation chamber of the belt conveyor (i.e., the closed cover body), and uses the ventilation component to dilute the harmful gases while timely discharging the harmful gases to the ground through the suction component, thereby reducing the concentration of harmful gases in the pressure isolation chamber of the belt conveyor and reducing safety hazards. In the above-mentioned technical scheme, the harmful gases are transferred from the soil bin to the pressure isolation chamber of the belt conveyor through a screw conveyor, but since the screw conveyor is mainly used to discharge slag, the harmful gases can only be entrained in the slag and discharged into the pressure isolation chamber of the belt conveyor, and the discharge efficiency is low. When there are more harmful gases in the stratum, the harmful gases are very easy to gather in the soil bin so that their concentration reaches the explosion limit, which poses a great safety hazard, and at this time the earth pressure shield machine needs to be shut down for exhaust, affecting the construction efficiency. Utility Model Content

[0005] The utility model aims to provide an earth pressure shield machine to solve the technical problem that when constructing in a stratum with a large content of harmful gases, the harmful gases in the soil bin of the prior art are only discharged through a screw conveyor, resulting in low harmful gas discharge efficiency and excessively high concentration of harmful gases in the soil bin, thus affecting safety.

[0006] To achieve the above purpose, the technical solution of the earth pressure shield machine provided by the utility model is:

[0007] A soil pressure shield machine comprises a soil bin and a closed cover for enclosing a belt conveyor, wherein the closed cover is provided with at least one exhaust port, the exhaust port is connected to an exhaust pipe, and the soil pressure shield machine also comprises an air guide pipe, one end of the air guide pipe is connected to the soil bin, and the other end is connected to the closed cover or the exhaust pipe.

[0008] As a further improvement, the closed cover body is provided with an air guide port for connecting to an air guide pipe, and the closed cover body is also provided with at least one air inlet for injecting fresh air into the closed cover body, and the air guide port is located near one of the air inlets.

[0009] As a further improvement, the air guide port is located at the front side of at least one air exhaust port.

[0010] As a further improvement, the closed cover body includes a main cover body and a connecting section sealed at the front end of the main cover body, the connecting section is used to seal and connect with the screw conveyor between the soil bin and the belt conveyor, the exhaust outlets are arranged on the main cover body, and the air guide port and the air inlet are arranged on the connecting section.

[0011] As a further improvement, the main cover body includes an inclined section and a horizontal section sealed to the rear end of the inclined section, and the air outlet is arranged on the inclined section.

[0012] As a further improvement, the rear end of the closed cover is open, and an air guide port for connecting to an air guide pipe is provided on the closed cover, and the air guide port is located at the front side of at least one exhaust port.

[0013] As a further improvement, an air outlet interface for connecting with the air guide pipe is provided on the soil bin, and the air outlet interface is located at the upper part of the soil bin.

[0014] As a further improvement, an air guide fan for discharging harmful gases in the soil bin is provided on the air guide pipe.

[0015] As a further improvement, a gas detection device for detecting the concentration of harmful gases is provided in the closed cover and / or the soil bin.

[0016] As a further improvement, the exhaust pipe is arranged above the closed cover body.

[0017] The beneficial effect is that the earth pressure shield machine provided by the utility model is an improvement on the prior art. In the earth pressure shield machine, an air guide pipe is arranged between the soil bin and the closed cover or the exhaust pipe to improve the exhaust efficiency of harmful gases in the soil bin, so that when the earth pressure shield machine is constructed in a stratum with a large content of harmful gases, the harmful gases in the soil bin can be discharged in time to prevent the harmful gases from accumulating in the soil bin and causing the concentration of harmful gases in the soil bin to be too high, thereby ensuring construction safety. Therefore, when the earth pressure shield machine is constructed in a stratum with a large content of harmful gases, it does not need to be stopped for exhaust, thereby ensuring construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an earth pressure shield machine in one embodiment of the utility model;

[0019] Figure 2 This is a schematic structural diagram of the inclined section of the closed cover body in one embodiment of the utility model;

[0020] Figure 3 for Figure 1 Cross-section at the middle BB;

[0021] Figure 4 This is a schematic diagram of the structure of the air inlet pipe in one embodiment of the utility model;

[0022] Figure 5 for Figure 1 Cross-sectional view at AA in the middle;

[0023] Figure 6 It is a side view of a connection section of a closed cover body in one embodiment of the utility model;

[0024] Figure 7 It is a top view of the closed cover body connecting section in one embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1. Shield body; 2. Soil bin; 3. Cutter head; 4. Screw conveyor; 5. Rear supporting trailer; 6. Closed cover; 7. Exhaust duct; 8. Exhaust fan; 9. Exhaust outlet; 10. Air inlet main pipe; 11. Air inlet branch pipe; 12. Air inlet fan; 13. Branch pipe fan; 14. Air duct; 15. Air duct fan; 16. Air duct; 17. Air inlet; 18. Belt conveyor. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the embodiments.

[0028] In order to solve the technical problems existing in the prior art, the basic concept of the utility model is to add an air duct to discharge the harmful gases in the soil bin into a closed cover or an exhaust duct, thereby improving the efficiency of discharging harmful gases in the soil bin and preventing excessive concentration of harmful gases in the soil bin during construction in strata with a high content of harmful gases.

[0029] The specific embodiment of the earth pressure shield machine provided by the utility model is as follows:

[0030] An earth pressure shield machine, see attached Figure 1 , including a shield body 1 and a soil bin 2 and a cutter disc 3 arranged at the front end of the shield body 1. The shield body 1 is also provided with a screw conveyor 4 for discharging the slag in the soil bin 2.

[0031] The shield body 1 is connected to the rear of the rear supporting trailer 5, and the rear supporting trailer 5 is provided with a belt conveyor 18 extending along the front and rear directions of the rear supporting trailer 5 and a belt conveyor ventilation system. The belt conveyor ventilation system includes a closed cover body 6, and the belt conveyor 18 is arranged in the closed cover body 6.

[0032] The screw conveyor 4 can transport the slag from the soil bin 2 to the belt conveyor 18 in the closed cover 6, and the belt conveyor 18 transfers the slag to the tail of the rear supporting trailer 5. The closed cover 6 can effectively prevent harmful gases from escaping from the slag and spreading into the tunnel during the slag transfer process.

[0033] The belt conveyor ventilation system also includes an air inlet duct, an air exhaust duct 7 and an air guide duct 14 .

[0034] The closed cover body 6 includes a main cover body and a connecting section located at the front end of the main cover body, and the main cover body includes an inclined section and a horizontal section. The connecting section, the inclined section and the horizontal section are arranged in sequence from front to back, and the connecting section and the inclined section, and the inclined section and the horizontal section are all sealed. The connecting section of the closed cover body 6 is sealed to the screw conveyor, and the specific structure of the sealed connection is prior art and will not be described here. Dividing the closed cover body 6 into a connecting section, an inclined section and a horizontal section can reduce the difficulty of manufacturing and assembling the closed cover body. In other embodiments, the closed cover body can also be assembled as a whole section.

[0035] See attached Figure 2 The upper side wall of the rear part of the inclined section is provided with an exhaust port 9. In other embodiments, the exhaust port 9 can also be provided at the front part of the horizontal section. One end of the exhaust pipe 7 is connected to the exhaust port 9, and the other end extends out of the tunnel and reaches the ground. The exhaust pipe 7 is provided with an exhaust fan 8, which can suck the harmful gas in the closed cover 6 and discharge it to the ground, thereby reducing the concentration of harmful gas in the closed cover 6. See the attached Figure 3The exhaust duct 7 is located above the closed cover 6, which can reduce the space occupied on the rear supporting trailer. The horizontal section of the closed cover 6 is fixedly connected to the exhaust duct 7, and the other part of the exhaust duct 7 is fixedly connected to the rear supporting trailer 5. The exhaust duct 7 is arranged above the closed cover 6 to save space on the rear supporting trailer 5. In other embodiments, the exhaust duct 7 and the closed cover 6 can also be arranged side by side.

[0036] See attached Figure 4 and attached Figure 5 The air inlet pipe includes an air inlet main pipe 10 and an air inlet branch pipe 11 connected to the air inlet main pipe 10. One end of the air inlet main pipe 10 extends out of the tunnel and reaches the ground. The other end of the air inlet main pipe 10 is an air supply port. The air inlet main pipe 10 is provided with an air inlet fan 12 for delivering fresh air from the ground into the tunnel. After the fresh air enters the tunnel through the air supply port, the normal air demand of the construction workers is maintained.

[0037] An air inlet 17 is provided on the upper side wall of the closed cover body 6, and one end of the air inlet branch pipe 11 away from the air inlet main pipe 10 is a pressure stabilizing port and is connected to the air inlet 17. The air inlet branch pipe 11 is also provided with a branch pipe fan 13, which is used to deliver fresh air in the air inlet main pipe 10 into the closed cover body 6, so as to keep the air pressure in the closed cover body 6 stable during the operation of the exhaust fan 8, increase the air flow speed in the closed cover body 6, improve the exhaust efficiency of harmful gases, and be able to dilute harmful gases in time to prevent harmful gases from accumulating to a critical concentration.

[0038] The upstream of the air inlet fan 12 is in a negative pressure state, the downstream of the air inlet fan 12 is in a positive pressure state, the air inlet branch pipe 11 is located downstream of the air inlet fan 12, and the branch pipe fan 13 is more likely to blow the fresh air in the air inlet main pipe 10 into the closed cover 6, so that a smaller power branch pipe fan 13 can be used. When the power of the branch pipe fan 13 is sufficient, the air inlet branch pipe 11 can also be set downstream of the air inlet fan 12.

[0039] The air inlet 17 is located in front of the air outlet 9. Figure 6 and attached Figure 7 Specifically, the air inlet 17 is located near the front end of the closed cover 6 to ensure that the harmful gas entering the closed cover 6 from the screw conveyor 4 can be diluted immediately. The diluted harmful gas flows backward along the closed cover 6, while carrying away the harmful gas in the slag, and is finally discharged from the exhaust port 9.

[0040] The upper side wall of the closed cover 6 is also provided with an air guide port 16, one end of the air guide pipe 14 is connected to the air guide port 16, and the other end is connected to the soil bin 2. The air guide pipe 14 is also provided with an air guide fan 15 for discharging harmful gases in the soil bin 2 into the closed cover 6. The air guide pipe 14 and the air guide fan 15 can share the pressure of harmful gases discharged from the soil bin 2 by the screw conveyor, improve the discharge efficiency of harmful gases in the soil bin 2, and prevent the concentration of harmful gases in the soil bin 2 from being too high. See Appendix Figure 6 and attached Figure 7 The air guide port 16 and the air inlet 17 are both located on the connecting section of the closed cover body 6, and the air guide port 16 is located near the air inlet 17 to ensure that the harmful gas entering the closed cover body 6 through the air guide port 16 can be diluted in time.

[0041] The soil bin 2 is provided with an air outlet interface for connecting to the air guide pipe 14, and the air outlet interface is located at the upper part of the soil bin 2. Harmful gases tend to gather at the top of the inner cavity of the soil bin 2, so setting the air outlet interface at the upper part of the soil bin 2 can make it easier to discharge harmful gases. In other embodiments, two or more air guide pipes 14 can also be provided. When the number of air guide pipes 14 is large, some of the air outlet interfaces can also be provided in the middle of the soil bin 2.

[0042] When constructing in a stratum with less harmful gas content, the air guide fan 15 may not be provided, and the harmful gas generated in the soil bin 2 during excavation enters the closed cover 6 by natural flow. Alternatively, the air guide fan 15 and the air guide pipe 14 are not provided, and only the screw conveyor 4 is used to discharge the harmful gas.

[0043] A gas detection device is also provided in the closed cover 6, which can monitor the concentration of harmful gases in the closed cover 6 in real time, so that construction personnel can adjust the power of the branch fan 13 and the exhaust fan 8 according to the concentration of harmful gases. In other embodiments, a gas detection device can also be provided in the soil bin 2 or in the tunnel wall. Alternatively, a gas detection device may not be provided in the closed cover 6, and an openable and closable observation door may be provided on the closed cover 6, so that construction personnel can use a handheld gas detection device to extend into the closed cover 6 from the observation door for manual detection.

[0044] In order to facilitate the conveyor belt to discharge the slag into the slag car of the marshaling train, the rear end of the closed cover in this embodiment is an open structure. The air inlet and the air guide are both arranged in front of the exhaust port to ensure that the harmful gas can be exhausted and prevent the harmful gas from leaking from the rear end of the closed cover. The positions of the air guide and the air inlet can be in no order. In other embodiments, the conveyor belt can also be directly extended to the outside of the tunnel. In this embodiment, the closed cover can also be extended to the outside of the tunnel. At this time, the exhaust port can be arranged in front, and the air inlet can be arranged in the back. In this way, the flow direction of the fresh air sent into the closed cover by the air inlet is opposite to the conveying direction of the slag, which can more easily take away the harmful gas in the slag. In this embodiment, the air guide can also be arranged at the back of the exhaust port.

[0045] In this embodiment, the air duct is connected to the closed cover body in order to simplify the overall structure. In other embodiments, the air duct may also be directly connected to the exhaust pipe.

[0046] In this embodiment, the exhaust port is arranged on the inclined section of the closed cover body, mainly because the harmful gas in the slag has basically escaped after being transported by the inclined section of the belt conveyor, and the harmful gas in the closed cover body can be discharged in time.

[0047] In this embodiment, the air inlet branch pipe is connected to the air inlet main pipe in order to reduce the number of pipes in the tunnel. In other embodiments, two air inlet pipes may be provided, the two air inlet pipes are used to provide fresh air to the tunnel and the closed cover respectively, and air inlet fans are provided on the two air inlet pipes.

[0048] In other embodiments, the number of air inlets and air outlets may be two. In this embodiment, branch pipes may be added to the exhaust pipe to connect to different exhaust ports, and the number of air inlet branches may be set to two. Alternatively, two exhaust pipes may be used to connect to two exhaust ports respectively. In other embodiments, the number of air inlets and air outlets may be 3, 4, 5, or other natural numbers greater than 2.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An earth pressure shield machine, comprising an earth bin and a closed cover for closing a belt conveyor, wherein the closed cover is provided with at least one exhaust port, the exhaust port being connected to an exhaust pipe, wherein: The earth pressure shield machine also includes an air guide pipe, one end of which is connected to the soil bin, and the other end of which is connected to the closed cover or the exhaust pipe.

2. The earth pressure shield machine according to claim 1, characterized in that: The closed cover body is provided with an air guide port for connecting the air guide pipe, and the closed cover body is also provided with at least one air inlet for injecting fresh air into the closed cover body, and the air guide port is located near one of the air inlets.

3. The earth pressure shield machine according to claim 2, characterized in that: The air guide port is located at the front side of at least one air exhaust port.

4. The earth pressure shield machine according to claim 3, characterized in that: The closed cover body includes a main cover body and a connecting section sealed at the front end of the main cover body, the connecting section is used for sealing connection with the screw conveyor between the soil bin and the belt conveyor, the exhaust outlets are arranged on the main cover body, and the air guide port and the air inlet are arranged on the connecting section.

5. The earth pressure shield machine according to claim 4, characterized in that: The main cover body comprises an inclined section and a horizontal section which is sealed and connected to the rear end of the inclined section, and the air outlet is arranged on the inclined section.

6. The earth pressure shield machine according to claim 1, characterized in that: The rear end of the closed cover is open, and an air guide port for connecting an air guide pipe is arranged on the closed cover, and the air guide port is located at the front side of at least one exhaust port.

7. The earth pressure shield machine according to any one of claims 1 to 6, characterized in that: The soil bin is provided with an air outlet interface for connecting with the air guide pipe, and the air outlet interface is located at the upper part of the soil bin.

8. The earth pressure shield machine according to any one of claims 1 to 6, characterized in that: An air guide fan for discharging harmful gases in the soil bin is arranged on the air guide pipe.

9. The earth pressure shield machine according to any one of claims 1 to 6, characterized in that: A gas detection device for detecting the concentration of harmful gases is arranged in the closed cover and / or the soil bin.

10. The earth pressure shield machine according to any one of claims 1 to 6, characterized in that: The exhaust pipe is arranged above the closed cover body.

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