Movable piston, shield receiving assembly and shield receiving system

Abstract

The utility model belongs to the field of shield receiving, and discloses a movable piston, a shield receiving assembly and a shield receiving system.The movable piston comprises a piston component used for moving in an embedded steel ring and / or a sleeve, one end of the piston component in the axial direction is open, and the other end of the piston component is closed; the open end of the piston component forms a containing cavity used for being filled with a tunneling protection medium so that a shield part can enter the containing cavity, and the periphery of the piston component is matched with the embedded steel ring and / or the sleeve in a sliding and sealing mode. According to the utility model, the length of the sleeve can be shortened, the existing shield receiving structure or mode can be simplified, the construction cost is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield receiving, and in particular relates to a mobile piston, a shield receiving component and a shield receiving system. Background Art

[0002] With the construction of a large number of subway lines, shield construction is being used more and more frequently. Every time the shield is started and accepted, it faces the problem of groundwater. On the one hand, the burial depth of subway stations is getting deeper and deeper, and the water and soil pressure during the start and acceptance period is getting higher and higher. On the other hand, as the country's requirements for environmental protection become more and more stringent, more and more stringent systems are adopted for groundwater extraction. Therefore, precipitation construction is generally not allowed during the start and acceptance of the shield, which makes the control of groundwater during the start and acceptance of the shield increasingly difficult.

[0003] At present, there are several main ways to receive the shield. One is to use the end reinforcement method, inject cement slurry into the stratum in the shield receiving area, and reinforce the receiving end stratum to a certain strength before receiving the shield; the second is to use the freezing consolidation method for the receiving end stratum, freeze the groundwater in the shield receiving area into a non-flowing state, and then receive the shield; the third is to use the full steel sleeve reception method, buckle a closed steel sleeve on the embedded steel ring at the receiving end, the length of the steel sleeve is longer than the length of the shield, and then backfill the soil in the closed steel sleeve. After the soil in the steel sleeve is backfilled and compacted, the shield completes the tunnel excavation and completely drills into the sealed steel sleeve, thereby completing the reception of the shield. The existing mainstream methods can achieve safe reception of shields, each with its own advantages and disadvantages, but the cost is relatively high, the construction period is relatively long, and the engineering volume is relatively large.

[0004] Among them, when a steel sleeve is used for receiving, the required sleeve length is often longer. In an existing shield receiving system, a plate similar to a piston is used to move in the sleeve, and a hydraulic cylinder is used as a driving device to provide support force to cope with the water pressure generated during the shield receiving process. Although this can better cope with the water pressure, the length of the sleeve is still maintained at a longer length, and the increase in the driving device also leads to increased costs, and the complexity of sleeve disassembly and assembly is also increased accordingly, and the construction is cumbersome and inefficient. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a movable piston, a shield receiving assembly and a shield receiving system to solve the problem that the existing shield receiving system needs to be matched with a longer sleeve for receiving.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, a moving piston is provided, which includes a piston member for moving within a pre-embedded steel ring and / or a sleeve. One end of the piston member is open axially and the other end is closed. The open end of the piston member forms a receiving cavity for filling a tunneling protection medium to allow a shield part to enter. The outer periphery of the piston member is in sliding seal fit with the pre-embedded steel ring and / or the sleeve.

[0008] In a possible implementation, the piston member includes an end closure and a cylindrical member. The end closure is connected to the inner side of the cylindrical member and closes one end of the cylindrical member. The outer periphery of the cylindrical member is in sliding seal fit with the pre-embedded steel ring and / or the sleeve.

[0009] In a possible implementation, an extension part extending axially is provided at the closed end of the cylindrical member, and a strengthening part is provided between the extension part and the end closure.

[0010] In a possible implementation, a filling part communicating with the receiving cavity is provided at the closed end of the piston member to fill the tunneling protection medium into the receiving cavity.

[0011] In a possible implementation, the piston member includes a plurality of splicing parts distributed circumferentially, and adjacent two splicing parts are connected by a flange or welded connection.

[0012] In a second aspect, a shield receiving assembly is also provided, which includes a pre-embedded steel ring and a moving piston as described in any of the above technical solutions for being arranged within the pre-embedded steel ring. A plurality of first elastic sealing assemblies distributed circumferentially are provided on the inner wall of the pre-embedded steel ring, and the outer periphery of the moving piston forms a sliding seal with the pre-embedded steel ring through the first elastic sealing assemblies.

[0013] In a possible implementation, it further includes a sleeve for being coaxially connected with the pre-embedded steel ring. A plurality of groups of second elastic sealing assemblies distributed circumferentially are provided on the inner wall of the sleeve, and the outer periphery of the moving piston forms a sliding seal with the sleeve through the second elastic sealing assemblies.

[0014] In a possible implementation, the axial length of the moving piston is greater than or equal to the distance between the second elastic sealing assembly within the pre-embedded steel ring and the first elastic sealing assembly within the sleeve.

[0015] In a possible implementation, a tail brush is provided at the outer end of the pre-embedded steel ring.

[0016] In a possible implementation, a tail brush is provided at the end of the sleeve away from the pre-embedded steel ring.

[0017] In a possible implementation, both the first elastic sealing assembly and the second elastic sealing assembly are provided with an adjustment assembly for adjusting the pressing force.

[0018] In a possible implementation, it further includes a transition ring connected between the sleeve and the embedded steel ring, and the inner diameters of the transition ring, the embedded steel ring, and the moving piston are the same.

[0019] In a third aspect, a shield receiving system is further provided, including a reaction force device, a shield receiving base, and a shield receiving component according to any one of the above technical solutions. The reaction force device is used to support the piston member before the piston member moves with the shield, and the shield receiving base is used to support the piston member and / or the shield.

[0020] Compared with the prior art, the present utility model has the following beneficial effects:

[0021] The moving piston of the present utility model, through a receiving cavity formed at one end that is open and the other end that is closed, can be filled with a tunneling protection medium for shield tunneling in the receiving cavity. The filled tunneling protection medium can not only make the moving piston have a relatively large weight to facilitate maintaining the balance of water and soil pressure during shield tunneling and protecting the moving piston, but also enable the moving piston to move relatively stably with the shield propulsion after a part of the shield enters the receiving cavity. At the same time, the moving piston maintains a sliding seal with the embedded steel ring and / or the sleeve, thereby realizing the reception of the shield and avoiding the situation where a longer sleeve and a driving device need to be provided for the sleeve.

[0022] The shield receiving component of the present utility model adopts the above-mentioned moving piston and a sleeve connected to the embedded steel ring, which enables the moving piston to utilize the inner space of the embedded steel ring to cooperate with the sleeve for reception. In this way, not only can the length of the sleeve be shorter, but also the moving piston can contact the second elastic sealing component in the embedded steel ring and the first elastic sealing component in the sleeve simultaneously to form multiple seals, which is more conducive to the stable reception of the moving piston and has better sealing performance.

[0023] A shield receiving system of the present utility model can simplify the existing shield receiving structure or method, reduce construction costs, and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of a moving piston;

[0025] Figure 2 It is a front view of a moving piston;

[0026] Figure 3 It is a partial bottom schematic diagram of a moving piston;

[0027] Figure 4 It is a cross-sectional view of a shield receiving component;

[0028] Figure 5 It is a cross-sectional view of the embedded steel ring of a shield receiving component;

[0029] Figure 6 It is a cross-sectional view of the sleeve of a shield receiving component;

[0030] Figure 7 It is a schematic structural diagram of a shield receiving component during installation;

[0031] Figure 8 It is a schematic diagram of the state of a shield receiving system after installation before shield receiving;

[0032] Figure 9 It is a schematic diagram of the state of a shield receiving system when preparing for shield receiving;

[0033] Figure 10 It is a schematic diagram of the state of a shield receiving system after the shield tunneling enters the accommodation cavity of the moving piston;

[0034] Figure 11 It is a schematic diagram of the state of a shield receiving system when removing the reaction device and installing the shield receiving base after the shield tunneling enters the accommodation cavity of the moving piston;

[0035] Figure 12 It is a schematic diagram of the state of a shield receiving system when the shield pushes the moving piston to partially exit the sleeve;

[0036] Figure 13 It is a schematic diagram of the state of a shield receiving system when the shield pushes the moving piston to completely exit the sleeve;

[0037] Figure 14 It is a schematic diagram of the state of a shield receiving system when the shield receiving is completed;

[0038] Figure 15 It is a schematic diagram of the preparation state of a shield receiving system when performing shield receiving in an anhydrous formation;

[0039] Figure 16 It is a schematic diagram of the state of a shield receiving system when the shield changes from tunneling to propulsion in an anhydrous formation;

[0040] Figure 17 It is a schematic diagram of the state of a shield receiving system when the shield pushes the moving piston to partially exit the embedded steel ring in an anhydrous formation;

[0041] Figure 18 It is a schematic structural diagram of a shield receiving system when no first elastic sealing component is provided in the embedded steel ring;

[0042] Figure 19 It is a schematic structural diagram of a shield receiving system when adding a transition ring for equal inner diameter receiving.

[0043] In the figure: 1 - moving piston; 11 - cylindrical part; 12 - end closure; 121 - addition port; 122 - inlet / outlet; 123 - flange plate; 13 - accommodation cavity; 14 - extension part; 15 - reinforcement plate; 16 - flange opening; 2 - embedded steel ring; 21 - first elastic sealing assembly; 22 - end flange; 23 - first gas path; 24 - first airbag; 25 - transition ring; 3 - sleeve; 31 - second elastic sealing assembly; 32 - flange connection part; 33 - second airbag; 34 - inflation interface; 4 - tail brush; 41 - connection ring; 5 - station end wall; 6 - portal; 7 - shield; 8 - reaction support frame; 9 - soil mass; 10 - shield receiving base; 100 - tunnel segment; 110 - grouting hole; 120 - solid sealant. Detailed implementation manners

[0044] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the specific implementation manners.

[0045] Please refer to Figure 1 As shown, an embodiment of the present application provides a moving piston, including a piston member for moving within the embedded steel ring 2 and / or the sleeve 3. One end of the piston member is open in the axial direction and the other end is closed. The open end of the piston member forms an accommodation cavity 13 for filling a tunneling protection medium to allow partial entry of the shield 7. The outer periphery of the piston member is in sliding seal cooperation with the embedded steel ring 2 and / or the sleeve 3.

[0046] The piston member is installed for sliding seal within the embedded steel ring 2 or the sleeve 3, or may have a longer length and be located within both the embedded steel ring 2 and the sleeve 3 simultaneously. While the piston member moves within the embedded steel ring 2 and / or the sleeve 3, it prevents the leakage of water and soil through sliding seal with the embedded steel ring 2 and / or the sleeve 3. One end of the piston member is open and the other end is closed, which enables the piston member to form an accommodation cavity 13 at the open end. This accommodation cavity 13 is used to fill tunneling protection media such as soil, sand, or mortar. The closed end can provide support, and in combination with the sliding seal cooperation between the outer periphery and the embedded steel ring 2 and / or the sleeve 3, it can prevent the leakage of water and soil. Through the tunneling protection medium, the moving member can have a greater weight to facilitate maintaining the water and soil pressure balance during the tunneling of the shield 7, and can also protect the shield 7 when it enters the accommodation cavity 13. After entry, the piston member can cover the end of the shield 7 for more stable movement. During the movement process, the piston member can simultaneously play the role of moving and positioning within the embedded steel ring 2 and / or the sleeve 3 and the role of sliding seal cooperation with the embedded steel ring 2 and / or the sleeve 3. In this way, the length of the sleeve 3 can be greatly reduced or even the sleeve 3 may not be required, and the embedded steel ring 2 with which it has sliding seal cooperation can be used for receiving the shield 7 in a waterless formation during shield receiving.

[0047] Through the above technical solution, the piston member can help maintain the balance of water and soil pressure during the tunneling of the shield 7 and protect the moving piston 1. Also, after a part of the shield 7 enters the accommodation chamber 13, the moving piston 1 can move relatively stably as the shield 7 advances. At the same time, the moving piston 1 maintains a sliding seal with the embedded steel ring 2 and / or the sleeve 3, so that the shield 7 can be received, and the situation where the sleeve 3 needs to be of a relatively long length and a driving device is provided is avoided.

[0048] In one embodiment, please continue to refer to Figure 1 As shown, the piston member may include an end closure 12 and a cylindrical member 11. The end closure 12 is connected to the inner side of the cylindrical member 11 and closes one end of the cylindrical member 11. The outer periphery of the cylindrical member 11 is in sliding sealing cooperation with the embedded steel ring 2 and / or the sleeve 3.

[0049] The cylindrical member 11 can not only have a relatively large outer peripheral area to be in sliding sealing cooperation with the embedded steel ring 2 and / or the sleeve 3, but also play a better role in moving and positioning. And in cooperation with the end closure 12, it can form an accommodation chamber 13 for filling the tunneling protection medium and for the shield 7 head to enter during tunneling. The structural design is more reasonable and practical. In the specific implementation process, the cylindrical member 11 and the end closure 12 can be connected in an integral connection manner such as by welding or integrally molded, or can be connected by a detachable connection manner such as by bolts, which is not limited. The end closure 12 is an end cap.

[0050] To improve the structural stability of the piston member, in combination with Figure 1 and Figure 2 As shown, further, an extension portion 14 extending axially is provided at the closed end of the cylindrical member 11, and a strengthening portion is provided between the extension portion 14 and the end closure 12.

[0051] In this way, through the extension portion 14, it is convenient to provide the strengthening portion. The strengthening portion can be supported between the extension portion 14 and the end closure 12 to prevent the end closure 12 from being easily deformed and damaged during the tunneling of the shield 7. And through the extension portion 14, the contact area for sliding sealing cooperation with the embedded steel ring 2 and / or the sleeve 3 can be further increased, which is more conducive to forming a reliable seal.

[0052] Specifically, the strengthening portion can be a triangular rib or a reinforcing plate 15, and there can be multiple of them distributed circumferentially, so that the structural stability of the piston member is better.

[0053] Since it is used for the reception of the shield 7, the volume of the piston member will be relatively large. If it is an integral structure, it is not conducive to transportation and installation. Therefore, in the embodiments of the present application, in combination with Figure 2 As shown, the piston member may include a plurality of splicing parts distributed circumferentially, and adjacent two splicing parts are connected by a flange connection or a welding connection.

[0054] By being divided into multiple splicing parts, it can be more convenient, faster, more flexible during installation and transportation, and also more convenient to replace.

[0055] In the specific implementation process, the piston member may include two upper and lower splicing parts that are spliced with each other. The extension part 14 of each splicing part is welded to the end closing member through a triangular reinforcing plate 15. The upper and lower splicing parts are connected through a flange plate 123 at the end closing member and are welded and connected at the front end of the cylindrical member 11.

[0056] In order to facilitate the filling of the tunneling protection medium into the accommodation cavity 13, in combination with Figure 2 as shown, one end of the piston member that is closed is provided with a filling part that communicates with the accommodation cavity 13 to fill the tunneling protection medium into the accommodation cavity 13. This filling part can be an addition port 121 opened on the end closing member 12, and the addition port 121 can be opened and closed through a cover plate connected by bolts, etc., so that it can be opened during filling and closed after filling.

[0057] In addition, an inlet and outlet 122 for personnel to enter and exit can also be provided on the end closing member 12, and the inlet and outlet 122 can also be opened and closed, which is convenient for personnel to enter for cleaning, installation or maintenance.

[0058] Please refer to Figures 4 - 7 as shown, an embodiment of the present application also provides a shield receiving assembly, including a pre-embedded steel ring 2 and a moving piston 1 as described in any one of the above technical solutions for being arranged inside the pre-embedded steel ring 2. The inner wall of the pre-embedded steel ring 2 is provided with a plurality of first elastic sealing components 21 distributed along the circumferential direction, and the outer periphery of the moving piston 1 forms a sliding seal with the pre-embedded steel ring 2 through the first elastic sealing components 21.

[0059] The pre-embedded steel ring 2 is arranged at the portal of the station. The moving piston 1 can be used in cooperation with the pre-embedded steel ring 2 and form a sliding seal cooperation with the first elastic sealing components 21 installed on the inner side of the pre-embedded steel ring 2. In this way, the moving piston 1 can be easily moved in the pre-embedded steel ring 2 and can also be sealed while moving. The scenario of the pre-embedded steel ring 2 cooperating with the moving piston 1 is preferably for shield 7 reception in a waterless formation.

[0060] In order to be applicable to shield 7 reception in a water-bearing formation and have better sealing performance, in an embodiment of the present application, it may further include a sleeve 3 coaxially connected to the pre-embedded steel ring 2. The inner wall of the sleeve 3 is provided with a plurality of groups of second elastic sealing components 31 distributed along the circumferential direction, and the outer periphery of the moving piston 1 forms a sliding seal with the sleeve 3 through the second elastic sealing components 31.

[0061] The sleeve 3 is coaxially connected to the embedded steel ring 2, which is equivalent to an extension of the embedded steel ring 2. The inner wall of the sleeve 3 is provided with a second elastic sealing component 31, which can form a sliding seal with the movable piston 1, so that the movable piston 1 can also be sealed when moving in the sleeve 3, and can form multiple seals with the first elastic sealing component 21 in the embedded steel ring 2. During the receiving process of the shield 7, as the receiving of the shield 7 proceeds, the first sealing component and the second sealing component can be pressed against the movable piston 1, the outer wall of the shield 7 and the tunnel segment 100 in turn, which can achieve sealing during the entire receiving process of the shield 7 and further improve the sealing effect.

[0062] Furthermore, the axial length of the movable piston 1 is greater than or equal to the distance between the second elastic sealing component 31 in the embedded steel ring 2 and the first elastic sealing component 21 in the sleeve 3 .

[0063] In this way, the outer periphery of the movable piston 1 can cover the embedded steel ring 2 and the sleeve 3 at the same time when preparing to receive, so that its outer periphery is in contact with the first elastic sealing component 21 and the second elastic sealing component 31 at the same time to achieve multi-pass sealing, thereby being able to more effectively prevent water and soil leakage.

[0064] In one application scenario, the reception of the shield 7 in waterless formations can be carried out by moving the piston 1 in cooperation with the embedded steel ring 2. By setting a tail brush 4 at the outer end of the embedded steel ring 2 (i.e., close to the station side), the tail brush 4 can form multiple seals with the first elastic sealing component 21 in the embedded steel ring 2, thereby meeting the sealing requirements of the shield reception.

[0065] In another application scenario, for the sleeve 3 provided for the water-bearing formation, in order to enhance the sealing between the end of the sleeve 3 and the moving piston 1 or the shield 7, the end of the sleeve 3 away from the embedded steel ring 2 is provided with a tail brush 4. The tail brush 4 is provided at the end of the sleeve 3, and the end of the sleeve 3 is provided with a flange connection part 32, and the tail brush 4 is fixed on the flange connection part 32 along the circumferential direction to form the last seal on the outside.

[0066] In the specific implementation process, the first elastic sealing component 21, the second elastic sealing component 31 and the tail brush 4 can adopt spring steel plate brushes, which are fixed to the inner wall along the circumferential direction and can be arranged in multiple paths along the circumferential direction, so as to form a sealing structure with better sealing performance; of course, the first elastic sealing component 21, the second elastic sealing component 31 and the tail brush 4 can also adopt other existing sealing structures without limitation.

[0067] When the first elastic sealing component 21, the second elastic sealing component 31 and the tail brush 4 adopt spring steel plate brushes, the pressing force will change due to the change in the diameter of the pressing object. When pressing and sealing the outer wall of the shield 7 and the tunnel segment 100, the pressing force relying only on its own elasticity may not be sufficient to achieve effective sealing.

[0068] To solve this problem, in the embodiment of the present application, the first elastic sealing component 21 and the second elastic sealing component 31 are both provided with an adjusting component for adjusting the pressing force.

[0069] Through the adjusting component, the pressing forces of the first elastic sealing component 21, the second elastic sealing component 31 and the tail brush 4 can be adjusted, so that the sealing performance can be better.

[0070] In a preferred embodiment of the adjusting component, as shown in Figure 5 and Figure 6 , the first elastic sealing component 21 includes a plurality of first spring steel plate brushes distributed in a circle along the circumferential direction. The adjusting component provided on the first elastic sealing component 21 may include a first airbag 24 provided between adjacent first elastic sealing components 21. The first airbag 24 is provided with a first air inlet, and the first air inlet is connected to an external first air pump through a first air path 23 buried in the embedded steel ring 2. The first air pump can inflate the first airbag 24, and by inflating, the elastic free end of the first spring steel plate brush can be squeezed, so that the elastic free end moves inward and tightly presses on the moving piston 1, the outer wall of the shield 7 or the tunnel segment 100.

[0071] Correspondingly, the adjusting component provided on the second elastic sealing component 31 has basically the same structure as the adjusting component on the first elastic sealing component 21. The difference is that the second airbag 33 included in the adjusting component is connected to a second air pump through a second air path passing through the sleeve 3, and the second air path is connected to the second air pump through an air filling interface 34. The tail brush 4 can be connected in series by passing a steel wire through the connecting rings 41 on each spring steel plate brush of the tail brush 4, and then the steel wire can be operated by a manual hoist to adjust the pressing force of the tail brush 4.

[0072] In an application scenario, as shown in Figure 19 , in order to achieve equal inner diameter reception of the moving piston and the embedded steel ring, a transition ring 25 connected between the sleeve 3 and the embedded steel ring 2 may also be included. The inner diameter of the transition ring 25, the inner diameter of the embedded steel ring 2 and the inner diameter of the moving piston are the same. The front end of the transition ring 25 is connected to the embedded steel ring 2, and the transition ring 25 and the sleeve 3 are connected by a flange. After the inner diameter of the sleeve 3 is enlarged, the inner diameter of the moving piston can be guaranteed to be consistent with the inner diameter of the embedded steel ring 2.

[0073] Please refer to Figures 8 - 17As shown in the figure, an embodiment of the present application further provides a shield receiving system, including a reaction force device, a shield receiving base 10, and a shield receiving component according to any one of the above technical solutions. The reaction force device is used to support the piston member before the piston member moves with the shield 7, and the shield receiving base 10 is used to support the piston member and / or the shield 7.

[0074] The reaction force device can support and fix the moving piston 1, which is beneficial for the moving piston 1 to more stably resist the driving force of the shield 7 during tunneling. In this way, after the shield 7 enters the accommodation cavity 13 of the moving piston 1, the reaction force device can be removed, and at this time, the moving piston 1 moves with the advancement of the shield 7. The shield receiving base 10 is mainly used for supporting the shield 7 during reception. Of course, it can also support the moving piston 1 and facilitate installation.

[0075] Specifically, the reaction force device may include a reaction force support frame 8, and the reaction force support frame 8 is connected to the end closure 12 and obliquely supported.

[0076] Please refer to Figures 8 - 17 As shown in the figure, the usage method of a shield receiving system according to an embodiment of the present application is as follows:

[0077] Step 1: Before the shield 7 enters the shield 7 receiving area, install the first elastic sealing assembly 21 on the inner wall of the embedded steel ring 2 at the portal 6 at the receiving end of the shield 7;

[0078] Step 2: Install the shield receiving base 10 in front of the receiving portal 6;

[0079] Step 3: Assemble the moving piston 1 on the shield receiving base 10. The front end of the splicing part of the moving piston 1 needs to be welded, and the rear end of the splicing part uses a flange plate 123 and is connected by bolts;

[0080] Step 4: After the moving piston 1 is assembled, it is pushed into the embedded steel ring 2. After the outer wall of the front end of the moving piston 1 pushes open the spring steel plate brushes in the embedded steel ring 2, these spring steel plate brushes are pressed against the outer wall of the moving piston 1, and at the same time, the front end of the moving piston 1 is attached to the station end wall 5 outside the station;

[0081] Step 5: Remove the shield receiving base 10;

[0082] Step 6: Assemble the sleeve 3 on the outside of the moving piston 1. First, assemble the base part of the sleeve 3, and then install the spring steel plate brushes in the sleeve 3 on the inner wall of the sleeve 3;

[0083] Step 7: Install the spring steel plate brushes on the upper half of the sleeve 3 on the inner wall of the sleeve 3 on the ground;

[0084] Step 8: Assemble the upper half and the lower half of the sleeve 3. The outer sides of the upper and lower parts of the sleeve 3 are connected by bolts;

[0085] Step 9: Push the assembled sleeve 3 into the position of the embedded steel ring 2. At this time, the spring steel plate brush of the sleeve 3 is pressed against the outer shell of the moving piston 1, as shown in Figure 8 ;

[0086] Step 10: Connect the end flanges 22 of the sleeve 3 and the embedded steel ring 2. Welding or bolt connection can be used. There are several flange openings 16 at the bottom of the moving piston 1. Open these flange openings 16 to facilitate the connection operation between the bottom area of the sleeve 3 and the embedded steel ring 2. After the bottom connection of the sleeve 3 and the embedded steel ring 2 is completed, cover the flange at the bottom area of the moving piston 1 and fasten it with bolts;

[0087] Step 11: Install a spring steel plate brush as the tail brush 4 on the flange connection part 32 of the sleeve 3. A steel wire rope can be fixed on this whole circle of spring steel plate brushes and tightened with a chain block. In this way, this circle of spring steel plate brushes will be reliably pressed against the outer surface of the moving piston 1, and the water-stop ability of the spring steel plate brush is better.

[0088] Step 12: Install a reaction device at the rear of the moving piston 1, as shown in Figure 8 ;

[0089] Step 13: Fill the moving piston 1 with soil mass 9 through the filling port 121 reserved on the moving piston 1 until the gap between the moving piston 1 and the station end wall 5 is completely filled with soil mass 9 and ensure that the filling is dense, as shown in Figure 9 ;

[0090] Step 14: The shield 7 cuts into the station end wall 5;

[0091] Step 15: The cutter head of the shield 7 cuts into the backfill soil mass 9;

[0092] Step 16: The cutter head of the shield 7 gradually approaches near the end cover of the moving piston 1. At this time, the cutter head and the cutting ring of the shield 7 completely enter the moving piston 1, as shown in Figure 10 ;

[0093] Step 17: Remove the reaction support frame 8, as shown in Figure 11 ;

[0094] Step 18: Install a shield receiving base 10 in front of the moving piston 1, as shown in Figure 11 ;

[0095] Step 19: The shield 7 pushes the moving piston 1 to slide on the shield receiving base 10, as shown in Figure 12 ;

[0096] Step 20: The moving piston 1 leaves the spring steel plate brush on the inner wall of the embedded steel ring 2. At this time, these spring steel plate brushes are pressed against the outer shell of the shield 7, as shown in Figure 12 ;

[0097] Step 21: The shield 7 pushes the moving piston 1 to continue sliding on the shield receiving base 10. The moving piston 1 leaves the area of the sleeve 3. At this time, the spring steel plate brush on the inner wall of the sleeve 3 is pressed against the outer shell of the shield 7. See Figure 13 ;

[0098] The shield 7 pushes the moving piston 1 to continue sliding on the shield receiving base 10 until the tail of the shield 7 completely leaves the area of the embedded steel ring 2. At this time, the spring steel plate brush on the embedded steel ring 2 is pressed against the outer surface of the tunnel segment 100. The combined sealing structure composed of the embedded steel ring 2, the spring steel plate brush, and the tunnel segment 100 also blocks the passage of muddy water outside the station from entering the station. Moreover, the combined sealing structure formed by the combination of the embedded steel ring 2, the sleeve 3, the spring steel ring brush, and the outer shell of the shield 7 can also block the passage of muddy water outside the station from entering the station. At this time, the first airbag 24 between the spring steel plate brushes can be hermetically inflated through the first air circuit 23. After inflating the first airbag 24, the soil mass 9 of the formation on the outside of the spring steel plate brush presses against it and cannot move. In this way, the inflated first airbag 24 will squeeze the spring steel plate brush, making the spring steel plate brush fit more tightly against the outer surface of the tunnel segment 100, enhancing the water-stopping ability of the spring steel plate brush. During the later production of the portal ring beam 6, when some tunnel segments 100 near the station at the portal 6 position are removed, the waterproof ability between the tunnel segment 100 and the embedded steel ring 2 will be weakened. With the spring steel plate brush, the water-stopping and sealing ability at this position will be significantly improved. Moreover, these spring steel plate brushes on the side close to the soil mass 9 do not need to be removed, which does not affect the later production of the portal ring beam 6 and can also prevent muddy water outside the station from entering the station during the production of the portal ring beam 6. During the production of the portal ring beam 6, it blocks the passage of muddy water outside the station from entering the station through the gap between the embedded steel ring 2 and the tunnel segment 100. This is the main purpose of setting these spring steel plate brushes;

[0099] Step 22: Grout and reinforce the soil mass 9 outside the tunnel through the grouting holes 110 on the tunnel segment 100. When these grouts solidify, a solid sealing body 120 is formed, which will block the passage of muddy water outside the station from entering the station.

[0100] Step 23: Remove the moving piston 1, the sleeve 3, the shield 7, and the shield receiving base to complete the shield 7 receiving work.

[0101] It should be noted that: Combined with Figures 15 - 17 , when receiving the shield in a formation with relatively low formation water pressure, the sleeve 3 can be not used, and tail brushes 4 are added to the first flange on the outside of the embedded steel ring 2. These tail brushes 4 are pressed against the outer shell of the moving piston 1, so that the shield 7 receiving operation can be completed.

[0102] If the fabrication of the cast-in-place ring beam of the tunnel and the station end wall in the later stage is not considered, the installation of the first elastic sealing assembly 21 can be cancelled. Combining with Figure 18 As shown, only the second elastic sealing assembly 31 and the tail brush 4 are used for sealing. In this way, the moving piston 1 can be shortened. While meeting the safe reception of the shield, the moving piston 1 will be shorter, the structure will be more firm, it will be easier to operate during the reception process, and it will be more conducive to installation and removal.

[0103] In the text, the first elastic sealing assembly 21 can be a sealing system composed of two or more tail brushes according to actual needs, without limitation. The second elastic sealing assembly 31 in the text can be a sealing system composed of two or more tail brushes. The more the number of the second elastic sealing assembly 31, the appropriate length of the sleeve 3 can be extended. The more the number of the second elastic sealing assembly 31, the higher the sealing ability of the reception system, and it is more suitable for the reception occasions with large groundwater water pressure or greater burial depth. Therefore, the adaptability of this patent is relatively strong.

[0104] The first elastic sealing assembly 21 and the second elastic sealing assembly 31 in the text can be spring steel plate wire brushes, or spring steel plate brushes, or sealing plates made of rubber or polyurethane, without limitation.

[0105] In addition, the first airbag 24 can be cancelled, and at the same time, the first air circuit 23 is changed to a shield tail grease injection pipeline. When the first elastic sealing assembly 21 needs to play a role, shield tail grease is injected into the cavity between the first elastic sealing assemblies 21 through the shield tail grease pipeline for sealing. Correspondingly, the second airbag 33 can also be cancelled, and at the same time, the inflation interface is changed to a shield tail grease injection pipeline. When the second elastic seal 31 needs to play a role, shield tail grease is injected into the cavity between the second elastic sealing assemblies 31 through the shield tail grease pipeline for sealing.

[0106] The above is only the preferred embodiment of the present utility model. It should be noted that the above preferred embodiment should not be regarded as a limitation of the present utility model. The protection scope of the present utility model should be subject to the scope defined by the claims. For those of ordinary skill in the art in this technical field, without departing from the spirit and scope of the present utility model, several improvements and retouches can also be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model.

Claims

1. A moving piston, characterized in that, It includes a piston member for moving within the embedded steel ring (2) and / or the sleeve (3). One end of the piston member is open axially and the other end is closed. The open end of the piston member forms a receiving cavity (13) for filling the tunneling protection medium to allow partial entry of the shield (7). The outer periphery of the piston member is in sliding and sealing fit with the embedded steel ring (2) and / or the sleeve (3).

2. A movable piston according to claim 1, wherein, The piston member includes an end closure (12) and a cylindrical member (11). The end closure (12) is connected to the inner side of the cylindrical member (11) and closes one end of the cylindrical member (11). The outer periphery of the cylindrical member (11) is in sliding and sealing fit with the embedded steel ring (2) and / or the sleeve (3).

3. A moving piston according to claim 2, wherein, The closed end of the cylindrical member (11) is provided with an extension portion (14) extending axially. There is a strengthening portion between the extension portion (14) and the end closure (12).

4. A moving piston according to claim 1, wherein The closed end of the piston member is provided with a filling portion communicating with the receiving cavity (13) for filling the tunneling protection medium into the receiving cavity (13).

5. A movable piston according to claim 1, wherein, The piston member includes a plurality of splicing portions distributed circumferentially. Adjacent two splicing portions are connected by flange connection or welding connection.

6. A shield receiving assembly, characterized in that, It includes an embedded steel ring (2) and a moving piston (1) as described in any one of claims 1 - 5 for being arranged within the embedded steel ring (2). The inner wall of the embedded steel ring (2) is provided with a plurality of first elastic sealing assemblies (21) distributed circumferentially. The outer periphery of the moving piston (1) forms a sliding seal with the embedded steel ring (2) through the first elastic sealing assemblies (21).

7. The shield receiving assembly according to claim 6, characterized in that, It further includes a sleeve (3) for being coaxially connected with the embedded steel ring (2). The inner wall of the sleeve (3) is provided with a plurality of groups of second elastic sealing assemblies (31) distributed circumferentially. The outer periphery of the moving piston (1) forms a sliding seal with the sleeve (3) through the second elastic sealing assemblies (31).

8. The shield receiving assembly according to claim 7, wherein, The axial length of the moving piston (1) is greater than or equal to the distance between the second elastic sealing assembly (31) within the embedded steel ring (2) and the first elastic sealing assembly (21) within the sleeve (3).

9. The shield receiving assembly according to claim 6, wherein The outer end of the embedded steel ring (2) is provided with a tail brush (4).

10. A shield receiving assembly according to claim 7, characterized in that, One end of the sleeve (3) facing away from the embedded steel ring (2) is provided with a tail brush (4); and / or, both the first elastic sealing assembly (21) and the second elastic sealing assembly (31) are provided with adjusting assemblies for adjusting the pressing force.

11. A shield receiving assembly according to claim 7, characterized in that, It further includes a transition ring (25) connected between the sleeve (3) and the embedded steel ring (2). The inner diameter of the transition ring (25), the inner diameter of the embedded steel ring (2), and the inner diameter of the moving piston are the same.

12. A shield receiving system, characterized in that, It includes a reaction device, a shield receiving base (10), and a shield receiving assembly as described in any one of claims 6 - 11. The reaction device is used to support the piston member before the piston member moves with the shield (7). The shield receiving base (10) is used to support the piston member and / or the shield (7).

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