A continuous belt conveyor device, an earth pressure shield machine and a slag discharging method thereof

Abstract

The present invention provides a continuous belt conveyor device, an earth pressure shield machine and a slag discharging method thereof, belonging to the technical field of tunnel excavation. A closed cover body is arranged outside the front section of the belt conveyor, an upper closed area is arranged above the extension platform, and a fixed sealing plate is arranged outside the rear section of the belt conveyor; an installation cover body that jointly encloses a closed installation space with the tunnel inner wall is fixed on the rear supporting trailer, which is used to realize the fixation of the newly installed belt conveyor support, the installation of the lower layer of idlers and the installation of a new fixed sealing plate. The continuous belt conveyor device adopted in the present invention reduces the transfer points in the slag discharging process, and by arranging closed measures at the front section of the belt conveyor, the extension platform and the rear section of the belt conveyor, the diffusion of asbestos fibers during the slag transportation process is avoided. At the same time, an installation cover body is arranged to complete the subsequent installation work of the belt conveyor extension and the installation operation of the fixed sealing plate, avoiding the leakage of asbestos fibers during the installation process. Overall, it can better prevent the diffusion of asbestos fibers and achieve an ideal protection effect.

Description

Technical Field

[0001] The present invention relates to a continuous belt conveyor device, an earth pressure shield machine and a slag discharging method thereof, belonging to the technical field of tunnel excavation. Background Art

[0002] In modern tunnel construction, asbestos formations are sometimes encountered. For example, when using an earth pressure shield, asbestos fibers are discharged along with the muck. Since asbestos fibers are prone to diffusion and can cause diseases such as asbestosis and pleural mesothelioma, they pose a great threat to the health of practitioners. Therefore, corresponding protective measures need to be designed on the shield machine.

[0003] The Chinese patent application for invention with the publication number CN113047856A discloses an earth pressure shield machine and a tunnel construction method for a formation rich in harmful gases. The earth pressure shield machine includes a cutter head, a shield body, a main drive, a segment erector, a screw conveyor and a rear support assembly. The rear support assembly includes a rear support trailer, a belt conveyor pressure isolation chamber, a suction assembly and a shield machine belt conveyor arranged in the belt conveyor pressure isolation chamber. The front end of the belt conveyor pressure isolation chamber is hermetically connected to the slag outlet of the screw conveyor, and the rear end of the belt conveyor pressure isolation chamber extends to the tunnel belt conveyor area at the tail of the rear support trailer. The shield machine belt conveyor can convey the slag discharged by the screw conveyor to the tunnel belt conveyor area. The suction assembly is communicated with the inner cavity of the belt conveyor pressure isolation chamber and can extract the gas in the inner cavity. In addition, a relay fan is arranged in the tunnel, and the relay fan is connected to the outlet of the exhaust fan, and can convey the harmful gas to the rear of the tunnel until it is sent out of the tunnel for collection or further treatment.

[0004] If the above earth pressure shield machine is applied to an asbestos formation, the belt conveyor pressure isolation chamber and the suction assembly adopted can reduce the diffusion of asbestos fibers in the muck conveyed by the shield machine belt conveyor to a certain extent. However, its slag discharging method is screw conveyor - shield machine belt conveyor (i.e., the rear support belt conveyor) - tunnel belt conveyor (generally a continuous belt conveyor). The belt conveyor pressure isolation chamber only covers the rear support belt conveyor, and the rear continuous belt conveyor is exposed for conveying. The asbestos fibers mixed in the muck will still diffuse. Although there is a relay fan at the rear, it will only cause the asbestos fibers to fill the long tunnel, which poses a great hazard to the operators in this area. In addition, asbestos fibers are easily attached to the clothes of the operators and are carried to other working areas of the equipment. Moreover, there is a transfer point between the rear support belt conveyor and the continuous belt conveyor, and asbestos fibers are more likely to break away from the muck and diffuse into the tunnel during the transfer process of the muck. Therefore, this slag discharging method cannot achieve an ideal protective effect. Summary of the Invention

[0005] The object of the present invention is to provide a slag discharging method for an earth pressure shield machine, so as to solve the problem that the existing slag discharging method of the earth pressure shield machine cannot effectively prevent the diffusion of asbestos fibers; the object of the present invention is also to provide a continuous belt conveyor device, so as to solve the problem that the existing slag discharging method of the belt conveyor cannot effectively prevent the diffusion of asbestos fibers; the object of the present invention is also to provide an earth pressure shield machine, so as to solve the problem that the existing earth pressure shield machine cannot effectively prevent the diffusion of asbestos fibers during the slag discharging process.

[0006] To achieve the above object, the slag discharging method of the earth pressure shield machine in the present invention adopts the following technical solution:

[0007] A slag discharging method for an earth pressure shield machine, which uses a continuous belt conveyor device in cooperation with a screw conveyor to achieve slag discharging. The front section of the belt conveyor, the extension platform and the rear section of the belt conveyor of the continuous belt conveyor device are all provided with sealing measures. Among them, the front section of the belt conveyor is sealed by an enclosed cover body, and an upper closed area that encloses the upper idlers and the conveyor belt is arranged above the extension platform. A continuous fixed sealing plate is arranged outside the rear section of the belt conveyor to form a closed slag transportation space. At the same time, a mounting cover body is fixed on the rear side of the extension platform on the trailing gantry. The mounting cover body and the tunnel inner wall jointly enclose a closed installation space to realize the fixation of the newly installed belt conveyor support, the installation of the lower idlers and the installation of a new fixed sealing plate. After the mounting cover body advances with the trailing gantry, the new fixed sealing plate is exposed outside the mounting cover body.

[0008] The beneficial effects of the above technical solution are as follows: The present invention creatively proposes a new slag discharging method. This slag discharging method uses a continuous belt conveyor device in cooperation with a screw conveyor to achieve slag discharging, reduces the transfer points in the slag discharging process, and solves the problem that asbestos fibers are easily separated from the slag and diffuse into the tunnel during the slag transfer process; among them, the front section of the belt conveyor is sealed by an enclosed cover body, and an upper closed area is arranged above the extension platform, which can enclose the upper idlers and the conveyor belt, so as to realize the closed transportation of the slag and prevent the asbestos fibers from overflowing; at the same time, a continuous fixed sealing plate is arranged outside the rear section of the belt conveyor to form a closed slag transportation space. In this way, the entire section of the continuous belt conveyor is provided with sealing measures, which can effectively prevent the diffusion of asbestos fibers. Moreover, a mounting cover body is fixedly installed on the rear side of the extension platform on the trailing gantry. The mounting cover body and the tunnel inner wall jointly enclose a closed installation space, which can realize the fixation of the newly installed belt conveyor support, the installation of the lower idlers and the installation of a new fixed sealing plate. That is to say, these installation operations are all realized inside the mounting cover body, which can prevent the asbestos fibers from overflowing. And after the mounting cover body advances with the trailing gantry, the new fixed sealing plate can be exposed outside the mounting cover body to realize the continuous installation setting of the fixed sealing plate.

[0009] In summary, the continuous belt conveyor device of the present invention reduces the transfer points in the slag discharge process. By setting enclosure measures at the front section of the belt conveyor, the extension table, and the rear section of the belt conveyor, the diffusion of asbestos fibers during the transportation of muck is avoided. At the same time, an installation cover is provided to complete the subsequent installation work of the belt conveyor extension and the installation operation of the fixed sealing plate, preventing the leakage of asbestos fibers during the installation process. Overall, it can better prevent the diffusion of asbestos fibers and achieve an ideal protection effect.

[0010] To achieve the above object, the following technical solutions are adopted for the continuous belt conveyor device in the present invention:

[0011] A continuous belt conveyor device successively includes a front section of the belt conveyor, an extension table, and a rear section of the belt conveyor from front to back. A closed cover is provided outside the front section of the belt conveyor, and the front end of the closed cover is used for sealed connection with the slag discharge port of the screw conveyor; an upper closed area is provided on the upper part of the extension table to enclose the upper idlers and the conveyor belt to achieve the closed transportation of muck, and the upper closed area is in sealed connection with the rear end of the closed cover; a continuous fixed sealing plate is provided outside the rear section of the belt conveyor to form a closed muck transportation space; the continuous belt conveyor device further includes an installation cover for being fixed on the rear support trailer and jointly enclosing a closed installation space with the tunnel inner wall. The installation cover is located behind the extension table, and a front extension inlet for the rear end of the extension table to extend into is provided on the front side wall of the installation cover, and a rear extension inlet for the front end of the fixed sealing plate to extend into is provided on the rear side wall of the installation cover. The closed installation space is used to fix the newly installed belt conveyor support, install the lower idlers, and install the new fixed sealing plate.

[0012] The beneficial effects of the above technical solution are as follows: The present invention improves the existing continuous belt conveyor, so that the front end of the closed cover at the front section of the belt conveyor is hermetically connected to the slag discharge port of the screw conveyor. That is, in the present invention, the continuous belt conveyor is used in cooperation with the screw conveyor, and the use of the rear supporting belt conveyor is cancelled, thereby reducing the transfer point in the slag discharge process and solving the problem that asbestos fibers are easily separated from the muck during the transfer process and spread into the tunnel. In addition, an upper closed area is provided on the upper part of the extension table, which can enclose the upper idlers and the conveyor belt therein, and the upper closed area is hermetically connected to the rear end of the closed cover, thereby realizing the closed transportation of muck and preventing the overflow of asbestos fibers. At the same time, a continuous fixed sealing plate is provided outside the rear section of the belt conveyor, forming a closed muck transportation space. In this way, closed measures are provided throughout the continuous belt conveyor, which can effectively prevent the diffusion of asbestos fibers. Moreover, the continuous belt conveyor device further includes an installation cover fixed on the rear supporting trailer and jointly enclosing a closed installation space with the tunnel inner wall. The front side wall and the rear side wall of the installation cover are respectively provided with insertion openings, ensuring the sealing of the rear end of the extension table and the front end of the fixed sealing plate, and reducing the risk of asbestos fibers leaking from the docking joints of the extension table and the fixed sealing plate with the installation cover. And the new belt conveyor support can be fixed, the lower idlers can be installed, and the new fixed sealing plate can be installed in the closed installation space. That is, these installation operations are all realized within the installation cover, which can prevent the overflow of asbestos fibers. And after the installation cover moves forward with the rear supporting trailer, the new fixed sealing plate can be exposed outside the installation cover, realizing the continuous installation setting of the fixed sealing plate.

[0013] In summary, the present invention uses a continuous belt conveyor device to reduce the transfer point in the slag discharge process, and by setting closed measures in the front section of the belt conveyor, the extension table and the rear section of the belt conveyor, it avoids the diffusion of asbestos fibers during the muck transportation process. At the same time, an installation cover is set to complete the subsequent installation work of the belt conveyor extension and the installation operation of the fixed sealing plate, avoiding the leakage of asbestos fibers during the installation process. Overall, it can better prevent the diffusion of asbestos fibers and achieve an ideal protection effect.

[0014] Furthermore, a lower closed area is provided in the lower part of the extension table for enclosing the lower idlers and the return belt therein, and the lower closed area is hermetically connected to the rear end of the closed cover.

[0015] The beneficial effects of the above technical solution are as follows: The lower closed area encloses the lower idlers and the return belt therein, avoiding the diffusion of asbestos fibers attached to the return belt into the tunnel. At the same time, the lower closed area is hermetically connected to the rear end of the closed cover, avoiding the leakage of asbestos fibers from here and improving the protection effect.

[0016] Furthermore, the middle part of the extension platform is used to install a new belt conveyor support and upper idlers, and a normally open water curtain is arranged at the position of the front extension inlet between the upper closed area and the lower closed area.

[0017] The beneficial effects of the above technical solution are as follows: The new belt conveyor support and upper idlers are installed from the middle part of the extension platform. Since the new belt conveyor support and upper idlers also need to enter the installation cover body as the rear support trailer advances, a normally open water curtain is arranged at the position of the front extension inlet between the upper closed area and the lower closed area. By using the normally open water curtain to form a barrier, it is convenient for the new belt conveyor support and upper idlers to enter the installation cover body, and at the same time, it can prevent the asbestos fibers in the installation cover body from overflowing, ensuring a good protection effect.

[0018] Furthermore, the installation cover body is used to contact the inner wall of the tunnel through a flexible seal.

[0019] The beneficial effects of the above technical solution are as follows: It is convenient for the smooth movement of the rear support trailer and can ensure the integrity of the closed installation space during the forward movement of the rear support trailer.

[0020] Furthermore, the fixed sealing plate is used to be fixed on the inner wall of the tunnel to jointly enclose the muck transportation space with the inner wall of the tunnel.

[0021] The beneficial effects of the above technical solution are as follows: Utilizing the structure of the inner wall of the tunnel itself can reduce the material consumption of the fixed sealing plate, facilitate the fixing operation, and make the space utilization in the tunnel more reasonable in combination with the installation position of the belt conveyor.

[0022] Furthermore, the fixed sealing plate is in an L shape, including a horizontal plate and a vertical plate that are vertically connected. The ends of the horizontal plate and the vertical plate are respectively used to be fixed on the inner wall of the tunnel.

[0023] The beneficial effects of the above technical solution are as follows: The L-shaped fixed sealing plate is convenient for processing and manufacturing and is also convenient for installation.

[0024] Furthermore, a water curtain spraying system and a humidity monitoring device are respectively installed in the upper closed area, the muck transportation space, and the closed installation space.

[0025] The beneficial effects of the above technical solution are as follows: The humidity monitoring device can detect the air humidity, so that the water curtain spraying system can be turned on according to the air humidity monitoring situation to ensure the air humidity in the closed environment and reduce the risk of asbestos fiber diffusion.

[0026] Furthermore, the closed cover body is configured with an exhaust system. The exhaust system includes an exhaust duct connected to the closed cover body, an exhaust fan, and a fiber filter connected to the exhaust duct.

[0027] The beneficial effects of the above technical solution are as follows: The exhaust system can extract the asbestos fibers floating in each closed link, reduce the risk of asbestos fiber leakage into other working environments in the tunnel. At the same time, the exhaust system includes a fiber filter to ensure the cleanliness of the discharged air and prevent harm to the outside world.

[0028] To achieve the above object, the earth pressure shield machine in the present invention adopts the following technical solution:

[0029] An earth pressure shield machine includes a screw conveyor, a rear support trailer and a continuous belt conveyor device. The continuous belt conveyor device successively includes a front section of the belt conveyor, an extension platform and a rear section of the belt conveyor from front to back. A closed cover body is arranged outside the front section of the belt conveyor, and the front end of the closed cover body is used for sealing connection with the slag discharge port of the screw conveyor; an upper closed area for enclosing the upper idler and the conveyor belt to achieve closed transportation of muck is arranged on the upper part of the extension platform, and the upper closed area is in sealed connection with the rear end of the closed cover body; a continuous fixed sealing plate is arranged outside the rear section of the belt conveyor to form a closed muck transportation space; the continuous belt conveyor device further includes a mounting cover body for being fixed on the rear support trailer and jointly enclosing a closed installation space with the inner wall of the tunnel. The mounting cover body is located at the rear side of the extension platform, and a front extension inlet for the rear end of the extension platform to extend into is arranged on the front side wall of the mounting cover body, and a rear extension inlet for the front end of the fixed sealing plate to extend into is arranged on the rear side wall of the mounting cover body. The closed installation space is used for fixing a newly installed belt conveyor support, installing a lower idler and installing a new fixed sealing plate.

[0030] The beneficial effects of the above technical solution are as follows: The present invention improves the slag discharging method of the existing earth pressure shield machine. By making the front end of the closed cover at the front section of the belt conveyor be hermetically connected to the slag outlet of the screw conveyor, that is, the continuous belt conveyor is used in cooperation with the screw conveyor in the present invention, and the use of the rear supporting belt conveyor is cancelled, thereby reducing the transfer points in the slag discharging process and solving the problem that asbestos fibers are easily separated from the muck during the transfer process of the muck and spread into the tunnel. In addition, an upper closed area is provided on the upper part of the extension table, which can enclose the upper idlers and the conveyor belt therein, and the upper closed area is hermetically connected to the rear end of the closed cover, thereby realizing the closed transportation of the muck and preventing the overflow of asbestos fibers. At the same time, a continuous fixed sealing plate is provided on the outside of the rear section of the belt conveyor, forming a closed muck transportation space. In this way, closed measures are provided throughout the entire section of the continuous belt conveyor, which can effectively prevent the diffusion of asbestos fibers. Moreover, the continuous belt conveyor device further includes an installation cover body fixed on the rear supporting trailer and jointly enclosing a closed installation space with the inner wall of the tunnel. The front side wall and the rear side wall of the installation cover body are respectively provided with insertion openings, ensuring the sealing of the rear end of the extension table and the front end of the fixed sealing plate, and reducing the risk of asbestos fibers leaking from the docking joints of the extension table and the fixed sealing plate with the installation cover body. And the installation operations such as the fixation of the newly installed belt conveyor support, the installation of the lower idlers, and the installation of the new fixed sealing plate can be realized within the closed installation space, that is, these installation operations are all realized within the installation cover body, which can prevent the overflow of asbestos fibers. And after the installation cover body advances with the rear supporting trailer, the new fixed sealing plate can be exposed outside the installation cover body, realizing the continuous installation setting of the fixed sealing plate.

[0031] In summary, the present invention uses a continuous belt conveyor device to reduce the transfer points in the slag discharging process, and by setting closed measures in the front section of the belt conveyor, the extension table and the rear section of the belt conveyor, it avoids the diffusion of asbestos fibers during the muck transportation process. At the same time, an installation cover body is set to complete the subsequent installation work of the belt conveyor extension and the installation operation of the fixed sealing plate, avoiding the leakage of asbestos fibers during the installation process, and overall can better prevent the diffusion of asbestos fibers and achieve an ideal protection effect.

[0032] Further, a lower closed area for enclosing the lower idlers and the return belt therein is provided at the lower part of the extension table, and the lower closed area is hermetically connected to the rear end of the closed cover.

[0033] The beneficial effects of the above technical solution are as follows: The lower closed area encloses the lower idlers and the return belt therein, avoiding the diffusion of asbestos fibers attached to the return belt into the tunnel. At the same time, the lower closed area is hermetically connected to the rear end of the closed cover, avoiding the leakage of asbestos fibers from this place and improving the protection effect.

[0034] Furthermore, the middle part of the extension platform is used to install a new belt conveyor support and upper idlers. A normally open water curtain is arranged at the position of the forward extension inlet between the upper closed area and the lower closed area.

[0035] The beneficial effects of the above technical solution are as follows: The new belt conveyor support and upper idlers are installed from the middle part of the extension platform. Since the new belt conveyor support and upper idlers also need to enter the installation cover body as the rear support trailer advances, a normally open water curtain is arranged at the position of the forward extension inlet between the upper closed area and the lower closed area. By using the normally open water curtain to form a barrier, it is convenient for the new belt conveyor support and upper idlers to enter the installation cover body, and at the same time, it can prevent the asbestos fibers in the installation cover body from overflowing, ensuring a good protection effect.

[0036] Furthermore, the installation cover body is used to contact the inner wall of the tunnel through a flexible seal.

[0037] The beneficial effects of the above technical solution are as follows: It is not only convenient for the smooth movement of the rear support trailer, but also can ensure the integrity of the closed installation space during the forward movement of the rear support trailer.

[0038] Furthermore, the fixed sealing plate is used to be fixed on the inner wall of the tunnel to jointly enclose the muck transportation space with the inner wall of the tunnel.

[0039] The beneficial effects of the above technical solution are as follows: Utilizing the structure of the inner wall of the tunnel itself can reduce the material consumption of the fixed sealing plate, facilitate the fixing operation, and make the space utilization in the tunnel more reasonable in combination with the installation position of the belt conveyor.

[0040] Furthermore, the fixed sealing plate is L-shaped, including a horizontal plate and a vertical plate that are vertically connected. The ends of the horizontal plate and the vertical plate are respectively used to be fixed on the inner wall of the tunnel.

[0041] The beneficial effects of the above technical solution are as follows: The L-shaped fixed sealing plate is convenient for processing and manufacturing and installation.

[0042] Furthermore, a water curtain spraying system and humidity monitoring devices are respectively installed in the upper closed area, the muck transportation space, and the closed installation space.

[0043] The beneficial effects of the above technical solution are as follows: The humidity monitoring devices can detect the air humidity, so that the water curtain spraying system can be turned on according to the air humidity monitoring situation to ensure the air humidity in the closed environment and reduce the risk of asbestos fiber diffusion.

[0044] Furthermore, the closed cover body is configured with an exhaust system. The exhaust system includes an exhaust duct connected to the closed cover body, an exhaust fan, and a fiber filter connected to the exhaust duct.

[0045] The beneficial effects of the above technical solution are as follows: The exhaust system can extract the asbestos fibers floating in each closed link, reducing the risk of asbestos fiber leakage into other working environments in the tunnel. At the same time, the exhaust system includes a fiber filter to ensure the cleanliness of the discharged air and prevent harm to the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic structural diagram of Embodiment 1 of the earth pressure shield machine of the present invention;

[0047] Figure 2 is Figure 1 the sectional view taken along the line A-A in

[0048] Figure 3 is Figure 1 the enlarged view of the extension table and the mounting cover in

[0049] Figure 4 is Figure 1 the sectional view taken along the line B-B in

[0050] Figure 5 is Figure 4 the enlarged view of the extension table in

[0051] Figure 6 is Figure 1 the sectional view taken along the line C-C in

[0052] Figure 7 It is the installation schematic diagram of the rear section of the belt conveyor in Embodiment 1 of the earth pressure shield machine of the present invention.

[0053] In the figure: 1. Cutter head; 2. Shield body; 3. Excavation chamber; 4. Segment; 5. Screw conveyor; 6. Flexible connection; 7. Rear support trailer; 8. Front section of the belt conveyor; 9. Enclosure; 10. Exhaust duct; 11. Main maintenance door; 12. Exhaust fan and fiber filter; 13. First special asbestos compartment; 14. Extension table; 15. Mounting cover; 16. Second special asbestos compartment; 17. Fresh air intake system; 18. Water curtain spraying system; 19. Upper closed area; 20. Middle installation area; 21. Lower idler; 22. Lower closed area; 23. Upper idler of the extension table; 24. Newly installed upper idler; 25. Chain; 26. Ladder; 27. Rear section of the belt conveyor; 28. Fixed sealing plate. DETAILED DESCRIPTION OF THE INVENTION

[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer and more explicit, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0056] It should be noted that relational terms such as "first" and "second" and the like that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, terms such as "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, elements defined by the statement "including an..." etc. do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0057] The features and performance of the present invention will be further described in detail below with reference to the embodiments.

[0058] Embodiment 1 of the earth pressure shield machine of the present invention:

[0059] The earth pressure shield machine of the present invention changes the previous slag discharge method of using a screw conveyor - a rear support belt conveyor - a continuous belt conveyor, and directly matches the continuous belt conveyor device with the screw conveyor, reducing the transfer points in the slag discharge process and the risk of asbestos leakage, especially suitable for the occasion where the entire tunnel passes through the asbestos formation. By setting enclosing measures at the front section, extension platform and rear section of the belt conveyor, the diffusion of asbestos fibers during the transportation of muck is avoided. At the same time, an installation cover is set to complete the subsequent installation work of the extension of the belt conveyor and the installation operation of the fixed sealing plate, avoiding the leakage of asbestos fibers during the installation process.

[0060] Specifically, as Figure 1As shown in the figure, the earth pressure shield machine includes a cutter head 1, a shield body 2, an excavation chamber 3, a screw conveyor 5, a trailing gantry 7 and a continuous belt conveyor device. Among them, the continuous belt conveyor device successively includes a front section 8 of the belt conveyor, an extension platform 14 and a rear section 27 of the belt conveyor from front to back. The front section 8 of the belt conveyor and the extension platform 14 are fixed on the trailing gantry 7, and the rear section 27 of the belt conveyor is fixed on the inner wall of the tunnel (i.e., the inner wall of the segment 4). Combining Figure 1 and Figure 2 As shown, a closed cover 9 is arranged outside the front section 8 of the belt conveyor. The front end of the closed cover 9 is hermetically communicated with the slag outlet of the screw conveyor 5 through a flexible connection 6, which not only ensures the sealing performance but also can adapt to the relative position change between the screw conveyor 5 and the closed cover 9. And, a number of maintenance doors are arranged along the closed cover 9. A first dedicated asbestos compartment 13 is connected to the main maintenance door 11. Daily maintenance enters or exits through the first dedicated asbestos compartment 13 and the main maintenance door 11. This asbestos compartment can meet the functions such as dirt cleaning and packing, showering, and changing clothes during the entry and exit of the operator, ensuring that the asbestos fibers will not be brought to other working areas of the equipment after the operator comes out.

[0061] In practical applications, the extension platform 14 should be close to the tail area of the whole trailing gantry 7. The specific structure of the extension platform is the prior art, such as the extension platforms disclosed in CN207192127U, CN217354385U, and CN214269015U. In this embodiment, as Figure 3 、 Figure 4 and Figure 5 As shown, an upper closed area 19 is arranged on the upper part of the extension platform 14 for enclosing the upper layer idlers 23 and the conveyor belt of the extension platform to realize the closed transportation of muck, avoiding the leakage of asbestos fibers into the tunnel; a lower closed area 22 is arranged on the lower part of the extension platform 14 for enclosing the lower idlers 21 and the return belt therein, and confining the possible asbestos pollution sources attached to the return belt in the lower closed area 22. Both the upper closed area 19 and the lower closed area 22 are formed by fixing steel plates on the extension platform support and enclosing the surrounding areas. And, in order to ensure the sealing performance of muck transportation, the upper closed area 19 and the lower closed area 22 are hermetically communicated with the rear end of the closed cover 9. A middle installation area 20 for installing a new belt conveyor support and new upper layer idlers 24 is formed in the middle of the extension platform 14, and the middle installation area 20 is an open structure.

[0062] As Figure 7As shown, a continuous fixed sealing plate 28 is provided outside the rear section 27 of the belt conveyor to form a closed muck transportation space, reducing the risk of asbestos fiber diffusion during muck transportation. The fixed sealing plate 28 is L-shaped, including a horizontal plate and a vertical plate that are vertically connected. The ends of the horizontal plate and the vertical plate are respectively fixed on the inner wall of the tunnel, and together with the inner wall of the tunnel, they enclose the above-mentioned muck transportation space, thus making use of the structure of the inner wall of the tunnel itself, which can reduce the material used for the fixed sealing plate 28, and at the same time, it is also convenient for the fixing operation and the rational use of the space in the tunnel.

[0063] As Figure 1 , Figure 3 and Figure 6 shown, the continuous belt conveyor device also includes a mounting cover 15 fixed on the rear support trailer 7 and enclosing a closed installation space together with the inner wall of the tunnel. The mounting cover 15 is a rigid structure and contacts the inner wall of the tunnel through a flexible seal, which is convenient for the smooth movement of the rear support trailer 7 and can ensure that the integrity of the closed installation space can always be guaranteed during the forward movement of the rear support trailer 7. The mounting cover 15 is located behind the extension platform 14, and a front extension inlet for the rear end of the extension platform 14 to extend into is provided on the front side wall of the mounting cover 15. A normally open water curtain is provided at the position between the upper closed area 19 and the lower closed area 22 of the front extension inlet. Since the new belt conveyor support and the newly installed upper idler 24 also need to enter the mounting cover 15 as the rear support trailer 7 steps forward, the position corresponding to the middle installation area 20 at the front extension inlet cannot be closed, and a barrier is formed by using the normally open water curtain, so that the extension platform 14 and the mounting cover 15 form two relatively closed spaces, which is convenient for the new belt conveyor support and the newly installed upper idler 24 to enter the mounting cover 15, and at the same time, it can also prevent the asbestos fibers in the mounting cover 15 from overflowing, ensuring a good protection effect.

[0064] A rear extension inlet for the front end of the fixed sealing plate 28 to extend into is provided on the rear side wall of the mounting cover 15, so that the transportation of muck on the belt conveyor is all in a closed space, reducing the risk of asbestos fiber overflow and dispersion. A ladder 26 is fixedly arranged on the rear support trailer 7 inside the mounting cover 15, which is convenient for fixing the newly installed belt conveyor support, installing the lower idler 21, and installing the new fixed sealing plate 28 in the closed installation space. Specifically, the newly installed belt conveyor support is fixed on the inner wall of the tunnel through a chain 25, combined with Figure 1 and Figure 6As shown, the operator enters the installation cover 15 through the second dedicated asbestos compartment 16, climbs onto the platform of the trailing gantry 7 via the ladder 26, completes the suspension of the chain 25 and the installation of the lower idler 21, and then installs the new fixed sealing plate 28 to cover the chain 25, the newly installed upper idler 24, and the lower idler 21. After the installation cover 15 advances with the trailing gantry 7, the new fixed sealing plate 28 will be exposed outside the installation cover 15, realizing the continuous installation of the fixed sealing plate 28.

[0065] As Figure 4 , Figure 5 and Figure 7 shown, a water curtain spraying system 18 and a humidity monitoring device (not shown in the figure) are respectively installed in the upper closed area 19 of the extension platform 14, the muck transportation space inside the fixed sealing plate 28, and the closed installation space inside the installation cover 15. During the operation of the belt conveyor, the humidity monitoring device can detect the air humidity, and thus the water curtain spraying system 18 can be turned on according to the air humidity monitoring situation to ensure the air humidity in the closed environment and reduce the risk of asbestos fiber diffusion. Finally, after the muck containing asbestos fibers is transported to the ground, it will be transferred to a specific area for burial treatment.

[0066] In addition, the closed cover 9 is equipped with an exhaust system. As Figure 1 shown, the exhaust system includes an exhaust duct 10 connected to the closed cover 9 and an exhaust fan and a fiber filter 12 connected to the exhaust duct 10. Since the closed cover 9, the extension platform 14, and the installation cover 15 are all connected, the exhaust system can extract the asbestos fibers floating in each closed link, reducing the risk of asbestos fibers leaking into other working environments in the tunnel. At the same time, the exhaust system includes a fiber filter to ensure the cleanliness of the discharged air and prevent harm to the outside. Additionally, as Figure 2 , Figure 4 and Figure 6 shown, the earth pressure shield machine also includes a fresh air intake system 17, which can blow the fresh air outside the tunnel into the trailing gantry 7 and the main machine area through a fan and then return it. It has a certain return air speed, which can ensure the breathing air demand of the workers in the tunnel and at the same time reduce the possible asbestos fiber concentration in the air in the trailing area, thus maintaining a healthy and safe environment in the trailing area.

[0067] In summary, the present invention uses a continuous belt conveyor device in cooperation with a screw conveyor to achieve slag discharge, reducing the transfer points in the slag discharge process and solving the problem that asbestos fibers are likely to separate from the muck during the transfer process and spread into the tunnel. At the same time, by setting enclosure measures at the front section of the belt conveyor, the extension platform and the rear section of the belt conveyor, the diffusion of asbestos fibers during the muck transportation process is avoided. And by setting an installation cover, the subsequent installation work of the belt conveyor extension and the installation operation of the fixed sealing plate can be completed, avoiding the leakage of asbestos fibers during the installation process. Overall, it can better prevent the diffusion of asbestos fibers and achieve an ideal protection effect.

[0068] In other embodiments of the earth pressure shield machine: This embodiment provides different air extraction methods. Different from Embodiment 1, the air extraction pipeline can be arranged in the muck transportation space inside the fixed sealing plate. Of course, in other embodiments, the air extraction system can also be not provided.

[0069] In other embodiments of the earth pressure shield machine: This embodiment provides different methods for preventing the diffusion of asbestos fibers. Different from Embodiment 1, the water curtain spraying system and the humidity monitoring device are only arranged in one of the upper closed area, the muck transportation space, and the closed installation space. Of course, in other embodiments, the water curtain spraying system and the humidity monitoring device can also be not provided.

[0070] In other embodiments of the earth pressure shield machine: This embodiment provides different shapes of the fixed sealing plate. Different from Embodiment 1, the fixed sealing plate is an arc-shaped plate.

[0071] In other embodiments of the earth pressure shield machine: This embodiment provides different installation methods of the fixed sealing plate. Different from Embodiment 1, the fixed sealing plate is not fixed on the inner wall of the tunnel. At the same time, the newly installed belt conveyor support is not suspended on the inner wall of the tunnel by a chain, but a rigid support is fixed on the inner wall of the tunnel, the newly installed belt conveyor support is fixed on the rigid support, and at the same time, the fixed sealing plate is also fixed on the rigid support and covers the newly installed belt conveyor support, the lower idler and the upper idler. At this time, the fixed sealing plate is in a cylindrical shape.

[0072] In other embodiments of the earth pressure shield machine: This embodiment provides different contact methods between the installation cover and the inner wall of the tunnel. Different from Embodiment 1, the installation cover is made of a material with better wear resistance and is in hard contact with the inner wall of the tunnel. Of course, in other embodiments, there can also be a gap between the installation cover and the inner wall of the tunnel. At this time, a normally open water curtain is set at the edge of the installation cover to prevent the overflow of asbestos fibers.

[0073] In other embodiments of the earth pressure shield machine: This embodiment provides different sealing methods at the forward extension inlet. Different from Embodiment 1, instead of the normally open water curtain, a sealing soft curtain is provided at the position of the forward extension inlet between the upper closed area and the lower closed area. Of course, in other embodiments, no sealing measures may be provided, and the water curtain spraying system in the closed installation space may be used to reduce the diffusion of asbestos fibers, or the exhaust system may be used to prevent the overflow of asbestos fibers.

[0074] In other embodiments of the earth pressure shield machine: This embodiment provides different closed area settings for the extension platform. Different from Embodiment 1, the lower closed area is not provided at the lower part of the extension platform. Since asbestos fibers are mainly concentrated in the muck and the amount adhering to the return belt is relatively small and can be ignored, or the return belt can be sprayed in the installation cover to prevent the diffusion of asbestos fibers on the emerging return belt.

[0075] An embodiment of the muck discharging method of the earth pressure shield machine in the present invention is as follows:

[0076] The earth pressure shield machine is the earth pressure shield machine in the above-mentioned embodiment, and the muck discharging method is as described above. The continuous belt conveyor device is used in cooperation with the screw conveyor to achieve muck discharging, reducing the transfer points in the muck discharging process. And the front section of the belt conveyor, the extension platform, and the rear section of the belt conveyor of the continuous belt conveyor device are all provided with sealing measures. Among them, the front section of the belt conveyor is enclosed by a closed cover, the upper part of the extension platform is provided with an upper closed area that encloses the upper idler and the conveyor belt, and a continuous fixed sealing plate is arranged outside the rear section of the belt conveyor to form a closed muck transportation space to realize the closed transportation of muck and prevent the overflow of asbestos fibers. At the same time, an installation cover is fixed on the rear side of the extension platform on the rear support trailer. The installation cover and the tunnel inner wall jointly enclose a closed installation space to realize the fixation of the newly installed belt conveyor support, the installation of the lower idler, and the installation of the new fixed sealing plate. That is, these installation operations are all realized within the installation cover, which can prevent the overflow of asbestos fibers. And after the installation cover follows the rear support trailer to step forward, the new fixed sealing plate can be exposed outside the installation cover to realize the continuous installation setting of the fixed sealing plate.

[0077] An embodiment of the continuous belt conveyor device in the present invention is: The specific structure of the continuous belt conveyor device is the same as that of the continuous belt conveyor device in the above-mentioned earth pressure shield machine embodiment and will not be repeated here.

[0078] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention is subject to the claims. All equivalent structural changes made by using the description and drawings of the present invention should be included in the protection scope of the present invention by the same token.

Claims

1. A slag discharge method for an earth pressure shield machine, characterized in that, a continuous belt conveyor device is used in cooperation with a screw conveyor (5) to achieve slag discharge. The front section (8) of the belt conveyor, the extension platform (14) and the rear section (27) of the belt conveyor are connected in sequence from front to back and are all provided with sealing measures. Among them, the front section (8) of the belt conveyor is sealed by a closed cover body (9), and the front end of the closed cover body is hermetically connected to the slag discharge port of the screw conveyor; an upper closed area (19) that encloses the upper idlers and the conveyor belt is arranged on the upper part of the extension platform (14), and the upper closed area is hermetically connected to the rear end of the closed cover body; a continuous fixed sealing plate (28) is arranged outside the rear section (27) of the belt conveyor to form a closed muck transportation space. At the same time, a mounting cover body (15) is fixed on the rear support trailer (7) at the rear side of the extension platform (14). The mounting cover body (15) and the tunnel inner wall jointly enclose a closed installation space to realize the fixation of the newly installed belt conveyor support, the installation of the lower idlers (21) and the installation of the new fixed sealing plate (28). After the mounting cover body (15) steps forward with the rear support trailer (7), the new fixed sealing plate (28) is exposed outside the mounting cover body (15).

2. A continuous belt conveyor device, which sequentially includes a front section (8) of the belt conveyor, an extension platform (14) and a rear section (27) of the belt conveyor from front to back, characterized in that, a closed cover body (9) is arranged outside the front section (8) of the belt conveyor, and the front end of the closed cover body (9) is used for hermetically connecting to the slag discharge port of the screw conveyor (5); an upper closed area (19) for enclosing the upper idlers and the conveyor belt to realize closed muck transportation is arranged on the upper part of the extension platform (14), and the upper closed area (19) is hermetically connected to the rear end of the closed cover body (9); a continuous fixed sealing plate (28) is arranged outside the rear section (27) of the belt conveyor to form a closed muck transportation space; the continuous belt conveyor device further includes a mounting cover body (15) for being fixed on the rear support trailer (7) and jointly enclosing a closed installation space with the tunnel inner wall. The mounting cover body (15) is located at the rear side of the extension platform (14), and a front extension inlet for the rear end of the extension platform (14) to extend into is arranged on the front side wall of the mounting cover body (15), and a rear extension inlet for the front end of the fixed sealing plate (28) to extend into is arranged on the rear side wall of the mounting cover body (15). The closed installation space is used for realizing the fixation of the newly installed belt conveyor support, the installation of the lower idlers (21) and the installation of the new fixed sealing plate (28).

3. The continuous belt conveyor device according to claim 2, characterized in that, a lower closed area (22) for enclosing the lower idlers (21) and the return belt is arranged at the lower part of the extension platform (14), and the lower closed area (22) is hermetically connected to the rear end of the closed cover body (9).

4. The continuous belt conveyor device according to claim 3, characterized in that, the middle part of the extension platform (14) is used for installing a new belt conveyor support and upper idlers, and a normally open water curtain is arranged at the position of the front extension inlet between the upper closed area (19) and the lower closed area (22).

5. The continuous belt conveyor device according to any one of claims 2 to 4, characterized in that, the installation cover (15) is used to contact the inner wall of the tunnel through flexible sealing.

6. The continuous belt conveyor device according to any one of claims 2 to 4, characterized in that, the fixed sealing plate (28) is used to be fixed on the inner wall of the tunnel to jointly enclose the muck transportation space with the inner wall of the tunnel.

7. The continuous belt conveyor device according to claim 6, characterized in that, the fixed sealing plate (28) is L-shaped, including a horizontal plate and a vertical plate connected vertically, and the ends of the horizontal plate and the vertical plate are respectively used to be fixed on the inner wall of the tunnel.

8. The continuous belt conveyor device according to any one of claims 2 to 4, characterized in that, a water curtain spraying system (18) and humidity monitoring devices are respectively installed in the upper closed area (19), the muck transportation space, and the closed installation space.

9. The continuous belt conveyor device according to any one of claims 2 to 4, characterized in that, the closed cover (9) is configured with an exhaust system, and the exhaust system includes an exhaust duct (10) connected to the closed cover (9) and an exhaust fan and a fiber filter (12) connected to the exhaust duct (10).

10. An earth pressure shield machine, comprising a screw conveyor (5), a trailing gantry (7) and a continuous belt conveyor device, characterized in that, the continuous belt conveyor device is the same as the continuous belt conveyor device according to any one of claims 2 to 9.

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