Assembled steel ring device for preventing gushing at subway tunnel portal

Abstract

This invention discloses an assembled subway tunnel portal anti-gushing steel ring device, relating to the field of tunnel construction technology. It includes a wall with a steel ring plate outside the wall and tubular segments inside the steel ring plate, with a gap between the tubular segments and the steel ring plate. It also includes an anti-gushing mechanism, with a gap adjustment mechanism outside the wall. The gap adjustment mechanism includes a curtain rubber plate disposed on the inner wall of the steel ring plate, and several folding pressure plates disposed on the inner side of the curtain rubber plate. Each folding pressure plate has a movable plate at its lower end, and a connecting shaft is provided between the movable plate and the folding pressure plate. A connecting groove is formed in the movable plate, and a lifting block is disposed in the connecting groove. A traction rope is provided between the lifting block and the connecting shaft. This assembled subway tunnel portal anti-gushing steel ring device can effectively prevent gushing caused by the gap between the tunnel boring machine and the tunnel during use.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to an assembled subway tunnel portal anti-gushing steel ring device. Background Technology

[0002] During shield tunnel construction, the shield machine will start from the station portal and then proceed to the next station, entering the station through the portal. The semi-circular shield pre-embedded portal steel ring reserved during the construction of the side wall at the end of the underground subway station serves as a circular portal steel mold during the pouring of the side wall at the end of the station, and has basically no other function.

[0003] However, existing steel rings still have some problems in use. During tunnel construction, gushing may occur, but the existing portal steel rings have simple structures and functions, and as portal templates, they do not have anti-gushing functions. Furthermore, when the tunnel boring machine enters or exits the portal, the gap between the portal steel ring and the tunnel boring machine is prone to water and sand inrush accidents, which can easily cause significant economic losses and safety accidents. However, existing portal steel rings cannot prevent water and sand inrush accidents caused by gaps. Summary of the Invention

[0004] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The present invention provides an assembled subway tunnel portal anti-gushing steel ring device to solve the existing technical problems.

[0005] The present invention adopts the following technical solution: an assembled subway tunnel portal anti-gushing steel ring device, including a wall, a steel ring plate is provided outside the wall, a pipe segment is provided inside the steel ring plate, a gap is provided between the pipe segment and the steel ring plate, and an anti-gushing mechanism is also included. The anti-gushing mechanism is provided inside the wall, and a gap adjustment mechanism is provided outside the wall. The gap adjustment mechanism is provided with a cooperating mechanism. The gap adjustment mechanism includes a curtain rubber plate, which is provided on the inner wall of the steel ring plate. Several folding pressure plates are provided on the inner side of the curtain rubber plate. Each folding pressure plate has a movable plate at its lower end. A connecting shaft is provided between the movable plate and the folding pressure plate. A connecting groove is opened in the movable plate, and a lifting block is provided in the connecting groove. A traction rope is provided between the lifting block and the connecting shaft.

[0006] Furthermore, the mating mechanism includes an adjusting shaft, which is disposed at the end of the fabric rubber sheet and located inside the fabric rubber sheet. The adjusting shaft is connected to the fabric rubber sheet via a connecting block. A mating groove is provided on one side of the adjusting shaft. A rotating shaft is disposed within the adjusting shaft. The rotating shaft and the adjusting shaft are connected via a one-way shaft. A roller is disposed outside the rotating shaft. A mating block is disposed at the end of the roller facing the adjusting shaft. The mating block and the roller are connected via a connecting spring. The adjusting shaft and the connecting shaft are connected via a connecting belt.

[0007] Furthermore, the surface of the roller is uneven, and the bottom surface of the roller is flush with the bottom surface of the fabric rubber sheet. The roller is rotatably connected to the rotating shaft, and the rotating shaft is fixedly connected to the adjusting shaft.

[0008] Furthermore, the diameter of the adjusting shaft is larger than the diameter of the connecting shaft, and the connecting shaft rotates synchronously with the adjusting shaft via a connecting belt.

[0009] Furthermore, the anti-spraying mechanism includes a collar, which is installed inside the wall. The collar has several mounting slots, and both the inner and outer mounting slots have fixing rings. Each fixing ring contains a steel ring assembly, which is connected to the fixing ring via a telescopic airbag. An elastic rubber pad is added to the inner edge of the steel ring assembly and the arc-shaped steel plate. An inflation tube is installed in the collar, and an elastic rubber washer is placed between two steel ring assemblies. A multi-functional tube is installed above the inflation tube, which is connected to both the elastic rubber ring and the telescopic airbag. An anti-bump steel plate is installed between the collar and the cavity, and the anti-bump steel plate is slightly higher than the inner hole of the collar.

[0010] Furthermore, the steel ring assembly is divided into three equal parts at 120° intervals, and each steel ring assembly consists of three shrinking steel rings. One end of each shrinking steel ring has a protrusion, and the other end has a concave opening. The protrusion of one shrinking steel ring is connected to the concave opening of another shrinking steel ring. The two shrinking steel rings are connected by a movable steel bar. A waterproof rubber plate is provided on the outside of the movable steel plate, and a shrinking guide rod is provided on the shrinking steel ring.

[0011] Furthermore, the outer diameter of the shrinking steel ring is larger than the diameter of the tunnel entrance, while the inner diameter of the shrinking ring is the same as the diameter of the tunnel boring machine shell.

[0012] Furthermore, one end of the retraction guide rod is fixed to the fixing ring by bolts, and the other end is fixed to the retraction ring by bolts. Retraction guide rods are provided on both sides of the retraction ring.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] Firstly, an anti-surge mechanism is installed. When the tunnel boring machine (TBM) enters the tunnel, this mechanism effectively prevents surges from occurring. During operation, a telescopic steel ring is installed. When the TBM enters the tunnel portal, the inflatable steel ring expands through an air inflator. Once inflated, the steel ring tightens the gap between the TBM and the portal using a rubber gasket, completing the first layer of anti-surge sealing. Secondly, an elastic rubber gasket is placed between the two telescopic steel rings. When the TBM enters the portal, the air cushion ring in the middle groove contracts inward to fit close to the TBM's outer shell. Inflating the rubber gasket causes the annular rubber ring in the groove to bulge, filling the gap between the TBM and the portal and creating strong pressure on the TBM's outer shell, thus achieving the second layer of anti-surge sealing. Because the rubber gasket is made of high strength and has an outer metal wire casing, the friction during TBM operation will not damage the rubber gasket or cause a blowout.

[0015] Secondly, through the combined action of the gap adjustment mechanism and the cooperation mechanism, mud and water can be prevented from flowing into the end shaft before the tunnel boring machine (TBM) receives the equipment. When the shield shell of the TBM is pushed into the end shaft, the folding blade pressure plate can press the rubber curtain as tightly as possible. The pressed rubber curtain will fit against the outer surface of the TBM, thereby preventing mud and slurry from leaking out of the tunnel portal. Due to the presence of mud and sand on the surface of the TBM, friction between the TBM and the rubber curtain during the tunneling process will cause the rubber curtain to wear. When the rubber curtain wears down, a gap may appear between the rubber curtain and the TBM, which will lead to sand inrush. However, the cooperation mechanism can prevent mud and sand from contacting the rubber curtain, thereby avoiding the possibility of wear on the rubber curtain, increasing the service life of the rubber curtain, and also achieving the effect of preventing sand inrush.

[0016] Third, a steel plate slightly higher than the portal steel ring is installed on the outside of the steel ring, close to the underground continuous wall. The anti-knock steel plate can prevent the shield machine from pressing down on the bottom of the steel ring, which would affect the anti-gushing treatment effect of the portal during the start or reception.

[0017] In summary, when in use, the device, through the arrangement of multiple steel rings and sealing airbags, can prevent gaps between the tunnel portal steel ring and the tunnel boring machine, thus preventing water and sand inrush accidents, avoiding significant economic losses and safety incidents. At the same time, with the action of the gap adjustment mechanism and the cooperating mechanism, it can prevent water from gushing out of the steel ring and affecting the port well when the tunnel boring machine enters, thereby ensuring that the port well can be used normally. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the main body of the present invention;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the collar of the present invention;

[0022] Figure 4 This is a schematic cross-sectional view of the shrinkage steel ring structure of the present invention;

[0023] Figure 5 This is a first-view structural schematic diagram of the shrinkable steel ring of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A in the middle;

[0025] Figure 7 For the present invention Figure 5 Enlarged structural diagram at point B;

[0026] Figure 8 This is a schematic diagram of the shrinkage steel ring structure from a second perspective of the present invention;

[0027] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C;

[0028] Figure 10 This is a schematic diagram of the gap adjustment mechanism of the present invention;

[0029] Figure 11 This is a schematic diagram of the connection structure between the movable plate and the folding blade pressure plate of the present invention;

[0030] Figure 12 This is a schematic diagram of the adjusting shaft structure of the present invention;

[0031] Figure 13 This is a schematic diagram of the roller structure of the present invention;

[0032] Figure 14 This is a schematic diagram of the working state of the rubber sheet of the present invention;

[0033] Figure 15This is a schematic diagram illustrating the working state changes of the movable steel ring of the present invention;

[0034] Figure 16 This is a schematic diagram of the installation of the anti-collision steel plate of the present invention.

[0035] Figure label:

[0036] 1. Wall; 11. Steel ring plate; 2. Gap adjustment mechanism; 21. Curtain rubber sheet; 22. Folding pressure plate; 23. Connecting shaft; 24. Hanging block; 25. Movable plate; 26. Traction rope; 3. Anti-spraying mechanism; 31. Inflatable pipe; 32. Multifunctional pipe; 33. Collar; 34. Sealing airbag; 35. Mounting groove; 36. Elastic rubber gasket; 37. Shrinkable steel ring; 38. Telescopic airbag; 39. Fixing ring; 310. Waterproof rubber sheet; 311. Concave opening; 312. Protrusion; 313. Shrinkable guide rod; 314. Movable steel bar; 4. Matching mechanism; 41. Connecting belt; 42. Matching groove; 43. Adjusting shaft; 44. Rotating shaft; 45. Matching block; 46. Roller; 5. Anti-bump steel plate. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0039] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The following is combined with Figures 1 to 16 As shown, this embodiment of the invention provides an assembled subway tunnel portal anti-gushing steel ring device, including a wall 1, a steel ring plate 11 disposed outside the wall 1, a pipe segment disposed inside the steel ring plate 11, a gap being provided between the pipe segment and the steel ring plate 11, and an anti-gushing mechanism 3 disposed inside the wall 1. A gap adjustment mechanism 2 is disposed outside the wall 1, and a cooperating mechanism 4 is disposed in the gap adjustment mechanism 2. The gap adjustment mechanism 2 includes a curtain rubber plate 21 disposed on the inner wall of the steel ring plate 11, and a plurality of folding pressure plates 22 are disposed on the inner side of the curtain rubber plate 21. Each folding pressure plate 22 has a movable plate 25 at its lower end, and a connecting shaft 23 is disposed between the movable plate 25 and the folding pressure plate 22. A connecting groove is opened in the movable plate 25, and a lifting block 24 is disposed in the connecting groove. A traction rope 26 is disposed between the lifting block 24 and the connecting shaft 23.

[0043] During operation, the device, through the arrangement of multiple steel rings and sealing airbags 34, can prevent gaps between the tunnel portal steel ring and the tunnel boring machine, thus preventing water and sand inrush accidents, avoiding significant economic losses and safety accidents. At the same time, under the action of the gap adjustment mechanism 2 and the cooperating mechanism 4, it can prevent water from gushing out of the steel ring when the tunnel boring machine enters, thereby affecting the port well.

[0044] Specifically, the mating mechanism 4 includes an adjusting shaft 43, which is located at the end of the curtain rubber sheet 21 and inside the curtain rubber sheet 21. The adjusting shaft 43 is connected to the curtain rubber sheet 21 via a connecting block. A mating groove 42 is provided on one side of the adjusting shaft 43. A rotating shaft 44 is provided in the adjusting shaft 43. The rotating shaft 44 and the adjusting shaft 43 are connected by a one-way shaft. A roller 46 is provided outside the rotating shaft 44. A mating block 45 is provided at the end of the roller 46 facing the adjusting shaft 43. The mating block 45 and the roller 46 are connected by a connecting spring. The adjusting shaft 43 and the connecting shaft 23 are connected by a connecting belt 41.

[0045] During operation, in the initial stage when the tunnel boring machine enters, the roller 46 drives the mating block 45 to rotate, but the movable plate 25 cannot rotate. At this time, the mating block 45 moves out of the mating groove 42, allowing the roller 46 to rotate under the influence of the tunnel boring machine. However, the movable plate 25 will not continue to move. Since the rotating shaft 44 and the adjusting shaft 43 are connected by a one-way shaft, the adjusting shaft 43 will not reverse after the mating block 45 is disengaged from the mating groove 42. This ensures the contact force between the movable plate 25 and the curtain rubber plate 21, allowing the curtain rubber plate 21 to be used in close contact with the surface of the tunnel boring machine.

[0046] Specifically, the surface of the roller 46 is uneven, and the bottom surface of the roller 46 is flush with the bottom surface of the curtain rubber plate 21. The roller 46 is rotatably connected to the rotating shaft 44, and the rotating shaft 44 is fixedly connected to the adjusting shaft 43.

[0047] During operation, the uneven surface of the roller 46 results in greater friction. As the tunnel boring machine (TBM) enters the tunnel, the TBM comes into contact with the roller 46, causing the roller 46 to rotate.

[0048] Specifically, the diameter of the adjusting shaft 43 is larger than the diameter of the connecting shaft 23, and the connecting shaft 23 rotates synchronously with the adjusting shaft 43 via the connecting belt 41.

[0049] During operation, the rotation of roller 46 can effectively drive the connecting shaft 23 to rotate, and the driving force can be increased by setting large and small wheels.

[0050] Specifically, the anti-spraying mechanism 3 includes a collar 33, which has several mounting grooves 35. The collar 33 is set inside the wall 1. Each of the inner and outer mounting grooves 35 has a fixing ring 39. Each fixing ring 39 has a steel ring assembly. The steel ring assembly is connected to the fixing ring 39 by a telescopic airbag 38. An elastic rubber pad is added to the inner edge of the steel ring assembly and the arc-shaped steel plate. An inflation tube 31 is set in the collar 33. An elastic rubber gasket 36 is set between two steel ring assemblies. An inflation tube 31 is set in the collar 33. A multi-functional tube 32 is set above the inflation tube 31. The inflation tube 31 is connected to the elastic rubber ring and the telescopic airbag 38 respectively. An anti-bump steel plate 5 is set between the collar 33 and the cavity 1, and the anti-bump steel plate 5 is slightly higher than the inner hole of the collar 33.

[0051] Specifically, the steel ring assembly is divided into three equal parts at 120° intervals. Each steel ring assembly consists of three shrinking steel rings 37. One end of each shrinking steel ring 37 is provided with a protrusion 312, and the other end is provided with a concave opening 311. The protrusion 312 of one shrinking steel ring 37 is connected to the concave opening 311 of another shrinking steel ring 37. The two shrinking steel rings 37 are connected by a movable steel strip 314. A waterproof rubber plate 310 is provided on the outside of the movable steel plate, and a shrinking guide rod 313 is provided on the shrinking steel ring 37.

[0052] During operation, the combined use of the protrusion 312 and the concave opening 311 can prevent leakage and water gushing at the joint of the front shrinking steel ring 37 blocks. At the same time, the connection through the movable steel strip 314 can ensure that the shrinking steel ring 37 blocks can shrink on the same vertical plane and synchronously, avoiding deformation.

[0053] Specifically, the outer diameter of the shrinking steel ring 37 is larger than the diameter of the tunnel entrance, and the inner diameter of the shrinking ring is the same as the diameter of the tunnel boring machine shell.

[0054] Specifically, one end of the retraction guide rod 313 is fixed to the fixing ring 39 by bolts, and the other end is fixed to the retraction ring by bolts. Retraction guide rods 313 are provided on both sides of the retraction ring.

[0055] During operation, the retractable guide rod 313 is used to control the retractable steel ring 37 to tighten the shield shell, preventing it from being carried away by the tunnel boring machine and causing damage to the telescopic airbag 38.

[0056] During operation, when the tunnel boring machine (TBM) enters the tunnel, the anti-gushing mechanism 3 effectively prevents gushing from occurring. In use, due to the presence of a telescopic steel ring, the inflatable steel ring 37 expands through the inflation pipe 31 when the TBM enters the tunnel portal. Once inflated, the inflatable steel ring 37 tightens the gap between the TBM and the portal using a rubber gasket, thus completing the first layer of anti-gushing sealing. Furthermore, an elastic rubber gasket 36 is placed between the two inflatable steel rings 37. When the TBM enters the portal, the air cushion ring in the middle groove contracts inward to fit close to the TBM's outer shell. Inflating the rubber gasket causes the annular rubber ring in the groove to bulge, filling the gap between the TBM and the portal and exerting strong pressure on the TBM's outer shell, achieving the second layer of anti-gushing sealing. Because the rubber gasket is constructed with high strength and an outer metal wire casing, the friction during TBM operation will not damage the rubber gasket or cause a tire blowout.

[0057] Working principle: When the shield shell of the tunnel boring machine (TBM) is pushed into the end shaft, the rubber sheet 21, with its soft end, does not hinder the TBM's entry. Simultaneously, the rubber sheet 21 folds and tilts as the TBM enters. Since the rubber sheet 21 contacts the movable plate 25, the movable plate 25 rotates with the rubber sheet 21. Once the TBM enters the tunnel, its outer surface contacts the roller 46. Due to the uneven surface of the roller 46, its forward movement causes the roller 46 to rotate. The mating block 45 at the end of the roller 46 inserts into the mating groove 42 of the adjusting shaft 43, causing the adjusting shaft 43 to rotate as the roller 46 rotates. The adjustment shaft 43 and the connecting shaft 23 are connected by a connecting belt 41. When the adjustment shaft 43 rotates, it drives the connecting shaft 23 to rotate synchronously. When the connecting shaft 23 rotates, it winds up the traction rope 26. When the traction rope 26 is pulled, it pulls the movable plate 25 to move in the opposite direction to the tunnel boring machine's forward direction. At this time, the movable plate 25 will abut against the curtain rubber plate 21, allowing the curtain rubber plate 21 to contact the outer surface of the tunnel boring machine, avoiding gaps between the tunnel boring machine and the tunnel entrance, which could lead to water and sand inrush. At the same time, the roller 46 can prevent mud and sand from remaining on the surface of the tunnel boring machine, causing mud and sand to contact the curtain rubber plate 21 and causing wear on the curtain rubber plate 21. After the tunnel boring machine enters the tunnel, air is introduced through pre-buried pipes. The valve core of the airbag extends to the side of the station's steel ring. When the tunnel boring machine (TBM) enters the tunnel portal, it is rapidly inflated, causing the sealing airbag 34 inside the slot to bulge. Simultaneously, the telescopic airbag 38 is also inflated. When the telescopic airbag 38 is inflated, the contraction steel ring 37 unfolds. Once inflated and unfolded, the contraction steel ring 37 tightens the gap between the TBM and the tunnel portal using a steel ring rubber gasket, thus completing the first layer of anti-surge sealing. During use, an elastic rubber gasket 36 is placed between the two contraction steel rings 37. When the TBM enters the tunnel portal, the air cushion ring in the middle slot contracts inward to fit close to the TBM's outer shell, and by inflating the rubber airbag, the annular rubber ring inside the slot bulges, filling the gap between the TBM and the tunnel portal. This creates strong pressure on the tunnel boring machine's outer shell, achieving a second layer of anti-gushing sealing. Because the rubber air cushion is constructed with high strength and an outer metal wire casing, the friction during tunnel boring machine operation will not damage the rubber air cushion or cause a tire blowout. The multi-layered steel rings and sealing airbags 34 prevent gaps between the portal steel ring and the tunnel boring machine, preventing water and sand inrush accidents and avoiding significant economic losses and safety incidents. Simultaneously, the gap adjustment mechanism 2 and the cooperating mechanism 4 prevent water from gushing out of the steel ring during tunnel boring machine entry, thus avoiding impact on the port shaft. Furthermore, a slightly higher anti-collision steel plate, installed on the outside of the portal ring, adjacent to the diaphragm wall, is poured into the wall during the portal wall concrete pouring to prevent the ring from being crushed.Ensure the device is usable.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An assembled subway tunnel portal anti-gushing steel ring device, comprising a wall (1), a steel ring plate (11) provided outside the wall (1), a pipe segment provided inside the steel ring plate (11), and a gap provided between the pipe segment and the steel ring plate (11), characterized in that; It also includes an anti-spraying mechanism (3), which is set inside the wall (1). A gap adjustment mechanism (2) is set outside the wall (1). A cooperating mechanism (4) is set in the gap adjustment mechanism (2). The gap adjustment mechanism (2) includes a curtain rubber plate (21), which is set on the inner wall of the steel ring plate (11). Several folding pressure plates (22) are set on the inner side of the curtain rubber plate (21). A movable plate (25) is set at the lower end of each folding pressure plate (22). A connecting shaft (23) is set between the movable plate (25) and the folding pressure plate (22). A connecting groove is opened in the movable plate (25), and a hanging block (24) is set in the connecting groove. A traction rope (26) is set between the hanging block (24) and the connecting shaft (23). The cooperating mechanism (4) includes an adjusting shaft (43), which is located at the end of the curtain rubber plate (21) and inside the curtain rubber plate (21). The adjusting shaft (43) is connected to the curtain rubber plate (21) via a connecting block. A cooperating groove (42) is provided on one side of the adjusting shaft (43). A rotating shaft (44) is provided in the adjusting shaft (43). The rotating shaft (44) and the adjusting shaft (43) are connected by a one-way shaft. A roller (46) is provided outside the rotating shaft (44). A cooperating block (45) is provided at one end of the roller (46) facing the adjusting shaft (43). The cooperating block (45) and the roller (46) are connected by a connecting spring. The adjusting shaft (43) and the connecting shaft (23) are connected by a connecting belt (41). The anti-spray mechanism (3) includes a collar (33) and a steel ring assembly. The collar (33) is installed inside the wall (1). Several mounting grooves (35) are provided in the collar (33). A fixing ring (39) is provided in both the inner and outer mounting grooves (35). A steel ring assembly is provided in each fixing ring (39). The steel ring assembly is connected to the fixing ring (39) by a telescopic airbag (38). An elastic rubber pad is added to the inner edge of the arc-shaped steel plate of the steel ring assembly. An inflation tube (31) is provided in the collar (33), and an elastic rubber gasket (36) is provided between the two steel ring assemblies. An inflation tube (31) is provided in the collar (33), and a multi-functional tube (32) is provided above the inflation tube (31). The inflation tube (31) is connected to the elastic rubber ring and the telescopic airbag (38) respectively. An anti-bump steel plate (5) is provided between the collar (33) and the wall (1), and the anti-bump steel plate (5) is slightly higher than the inner hole of the collar (33).

2. The assembled subway tunnel portal anti-gushing steel ring device according to claim 1, characterized in that; The surface of the roller (46) is uneven, and the bottom surface of the roller (46) is flush with the bottom surface of the curtain rubber plate (21). The roller (46) is rotatably connected to the rotating shaft (44), and the rotating shaft (44) is fixedly connected to the adjusting shaft (43).

3. The assembled subway tunnel portal anti-gushing steel ring device according to claim 1, characterized in that; The diameter of the adjusting shaft (43) is larger than the diameter of the connecting shaft (23), and the connecting shaft (23) rotates synchronously with the adjusting shaft (43) through the connecting belt (41).

4. The assembled subway tunnel portal anti-gushing steel ring device according to claim 1, characterized in that; The steel ring assembly is divided into three equal parts at 120°. Each steel ring assembly is divided into three shrinking steel rings (37). One end of each shrinking steel ring (37) is provided with a protrusion (312), and the other end of each shrinking steel ring (37) is provided with a concave opening (311). The protrusion (312) of each shrinking steel ring (37) is connected to the concave opening (311) of another shrinking steel ring (37). The two shrinking steel rings (37) are connected by a movable steel bar (314). A waterproof rubber plate (310) is provided on the outside of the movable steel bar (314). A shrinking guide rod (313) is provided on each shrinking steel ring (37).

5. The assembled subway tunnel portal anti-gushing steel ring device according to claim 4, characterized in that; The outer diameter of the shrinking steel ring (37) is larger than the diameter of the tunnel entrance, and the inner diameter of the shrinking ring is the same as the diameter of the shield machine shell.

6. The assembled subway tunnel portal anti-gushing steel ring device according to claim 4, characterized in that; One end of the retraction guide rod (313) is fixed to the fixing ring (39) by bolts, and the other end is fixed to the retraction ring by bolts. Retraction guide rods (313) are provided on both sides of the retraction ring.

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