Shield construction sealing system and shield construction method

Abstract

The invention belongs to the technical field of shield construction, and discloses a shield construction sealing system and a shield construction method.The shield construction sealing system comprises a pre-buried steel ring; the sealing ring is coaxially connected to the embedded steel ring, and the working assembly is matched with the sealing ring and comprises a receiving assembly and / or an originating assembly; and the second air bag sealing assembly is arranged on the inner wall of the embedded steel ring. Multiple sealing matched with different sealing modes can be achieved, the sealing effect is remarkably improved, the length of the sealing ring can be effectively shortened through a better sealing structure, shield receiving and launching can be more convenient and cost is reduced through cooperation of the working assembly, the air bag is contained in a bag-shaped mode through the elastic sealing bag, and the sealing effect is improved. The air bag can be protected while being expanded along with the air bag, a larger expansion space can be provided for the air bag, the air bag with the larger size can be contained, and therefore the better sealing effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of shield construction, and in particular relates to a shield construction sealing system and a shield construction method. 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. This makes it increasingly difficult to control groundwater during the start and acceptance of the shield.

[0003] In the prior art, most shield machines are launched or received by wrapping the shield with a steel sleeve as a whole. The length of the steel sleeve used during construction is longer than the length of the shield. The steel sleeve used in this way is relatively long and complicated to use. In addition, only a spring brush is used for sealing, and the sealing effect is poor and single. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a shield construction sealing system and a shield construction method to solve the problems of excessively long sleeve length and poor sealing effect of the existing shield starting acceptance.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, a shield construction sealing system is provided, comprising:

[0007] Embedded steel ring;

[0008] A sealing ring coaxially connected to the embedded steel ring and a working component cooperating with the sealing ring, wherein the working component includes a receiving component and / or an initiating component; the receiving component includes a sealing cover, which is detachably arranged at one end of the sealing ring away from the embedded steel ring, so that the embedded steel ring, the sealing ring and the sealing cover form a receiving channel with one end open and the other end closed; the initiating component includes a shield initiating base for carrying the shield and a reaction frame for providing a reaction force for the shield;

[0009] A combined sealing device, the combined sealing device comprising an elastic sealing brush assembly and a first airbag sealing assembly both axially arranged on the circumferential inner wall of a sealing ring, the first airbag sealing assembly comprising a first elastic sealing bag, a first inflatable and deflable airbag and a first pressing assembly, the first elastic sealing bag made of an elastic fiber material comprising a bag portion and a bag opening edge, the first airbag being accommodated in the bag portion, and the bag opening edge being pressed and fixed to the inner wall of the sealing ring by the pressing assembly; and

[0010] A second airbag sealing assembly is arranged on the inner wall of the embedded steel ring.

[0011] In a possible implementation, a first mounting groove is circumferentially provided on the inner wall of the sealing ring, and the edge of the bag opening of the first elastic sealing bag is pressed and fixed in the first mounting groove by a first pressing assembly. When the first airbag sealing assembly is switched to a working state by inflating the first airbag, the first elastic sealing bag protrudes out of the first mounting groove toward the inner side of the sealing ring for sealing as the first airbag expands.

[0012] In a possible implementation, the elastic sealing brush assembly and the first airbag sealing assembly are provided in multiple groups, and at least one group of first airbag sealing assemblies is provided between every two adjacent groups of elastic sealing brush assemblies. The elastic sealing brush assembly is connected and installed with the first airbag sealing assembly via an annular mounting plate connected to the first holding assembly.

[0013] In a possible implementation, the bag opening edges of the first elastic sealing bags of two adjacent groups of the first airbag sealing assemblies are integrally connected.

[0014] In a possible implementation, the edge of the bag opening has an edge extension that is not held by the first holding assembly, the edge extension is provided with a through hole, a limiting member is provided through the through hole, and the limiting member forms a limiting relationship with the first holding assembly in a first direction parallel to the axial direction of the sealing ring.

[0015] In a possible implementation, a first blocking member is further provided on the inner side of the sealing ring, covering the first airbag sealing assembly to prevent it from freely falling inward, and the first blocking member can be broken or opened by the first airbag sealing assembly.

[0016] In a possible implementation, when the first airbag is in an uninflated storage state, the first elastic sealing bag and the first airbag therein are folded in the first installation groove in a concave-convex fit with each other.

[0017] In a possible implementation, the second airbag sealing assembly includes a second elastic sealing bag, an inflatable second airbag and a second pressing assembly. The second elastic sealing bag made of elastic fiber material accommodates the second airbag, and the edge of the bag opening of the second elastic sealing bag is pressed and fixed to the inner wall of the embedded steel ring by the second pressing assembly.

[0018] In a possible implementation, the embedded steel ring is provided with a second installation groove, the second airbag sealing assembly is connected in the second installation groove, and the inner side of the embedded steel ring is also provided with a second blocking member covering the second airbag sealing assembly to prevent it from freely falling inward, and the second blocking member can be broken or opened by the second airbag sealing assembly.

[0019] In a possible implementation, the embedded steel ring includes an inner ring portion, a main body portion and an outer ring portion arranged along the axial direction, the inner ring surface diameter of the main body portion is larger than the inner ring surface diameter of the inner ring portion and smaller than the outer diameter of the outer ring portion, the main body portion is formed with a stepped second mounting groove, and the free end of the second airbag sealing assembly in a free state extends out of the second mounting groove and is pressed against the inner wall of the inner ring portion by the second blocking member.

[0020] On the other hand, a shield construction method is also provided, based on the shield construction sealing system as described in any of the above technical solutions, characterized in that it includes a shield receiving construction method and / or a shield starting construction method:

[0021] The shield receiving construction method comprises the following steps:

[0022] Install embedded steel rings on the station end wall and reserve the airbag inflation pipeline for the second airbag sealing assembly;

[0023] Install the second airbag sealing assembly in the embedded steel ring, connect the second airbag air nozzle of the second airbag sealing assembly to the airbag inflation pipeline, and the second airbag assembly is blocked in the second installation groove by the second blocking member;

[0024] A sealing ring matched with a receiving assembly is coaxially installed on the embedded steel ring through a transition ring, and the tail end of the sealing ring is closed by a sealing cover of the receiving assembly;

[0025] A first airbag sealing assembly and an elastic sealing brush assembly are installed in the sealing ring, and a first elastic sealing bag and a first airbag of the first airbag sealing assembly are blocked in the first mounting groove by a first blocking member;

[0026] A support frame is installed on the rear side of the sealing cover, and the support frame is connected to the sealing cover to support the sealing component;

[0027] Fill the sealing component with excavation protection medium to prepare for the shield to receive it;

[0028] After the shield tunneling enters the sealing ring, the second airbag sealing assembly and the first airbag sealing assembly are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing assembly and the second airbag sealing assembly are pressed against the outer wall of the shield for sealing;

[0029] Connect and install the shield receiving base on the rear side of the sealing cover;

[0030] The shield machine continues to advance and when it advances to a position close to the sealing cover, the sealing cover is removed and the shield machine is controlled to continue to advance;

[0031] When the shield machine is advanced to the shield receiving base and leaves the station portal area, cement slurry is injected through the grouting holes on the tunnel segments. After the cement slurry solidifies, a solid seal is formed to block mud and water outside the station from entering the station.

[0032] The shield, receiving components and sealing rings are removed, and the shield reception is completed.

[0033] The shield construction method comprises the following steps:

[0034] Install embedded steel rings on the station end wall and reserve the airbag inflation pipeline for the second airbag sealing assembly;

[0035] Install a second airbag sealing assembly in the embedded steel ring, connect the second airbag air nozzle of the second airbag sealing assembly to the airbag inflation pipeline, and hold the second airbag assembly on the inner wall of the embedded steel ring by the second blocking member;

[0036] A sealing ring matched with the starting assembly is coaxially installed on the embedded steel ring through a transition ring;

[0037] A first airbag sealing assembly and an elastic sealing brush assembly are installed in the sealing ring, and a first elastic sealing bag and a first airbag of the first airbag sealing assembly are blocked in the first mounting groove by a first blocking member;

[0038] Install the shield starting base and reaction frame on the rear side of the sealing ring, assemble the shield on the shield starting base and assemble the tunnel segments between the shield and the reaction frame;

[0039] When the shield is advanced into the embedded steel ring, the second airbag sealing component and the first airbag sealing component are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing component and the second airbag sealing component are pressed against the outer wall of the shield for sealing;

[0040] The shield machine starts to move until it leaves the tunnel portal area of ​​the station. At the same time, cement slurry is injected through the grouting holes on the tunnel segments. After the cement slurry solidifies, a solid seal is formed to block the mud and water outside the station from entering the station, and the start is completed.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The shield construction sealing system of the present invention can realize multiple seals with different sealing modes by arranging a combined sealing device on the sealing ring and arranging a second airbag sealing assembly on the embedded steel ring, thereby significantly improving the sealing effect, and can also effectively shorten the length of the sealing ring through a more optimal sealing structure. The working assembly can make the receiving and starting of the shield more convenient and reduce the cost. The airbag is accommodated in a bag-like manner through an elastic sealing bag, so that it can protect the airbag while expanding with the airbag, and can provide a larger expansion space for the airbag and accommodate airbags of larger sizes, thereby achieving a better sealing effect.

[0043] The shield construction method of the present invention, based on the above-mentioned shield construction system, can shorten the starting sleeve or the receiving sleeve to a very short length, greatly simplifying the shield starting and receiving process flow, and can provide stronger sealing capability, and the safety is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a shield construction sealing system when used for shield reception

[0045] Figure 2 It is a structural schematic diagram of a shield construction sealing system when used for shield construction start-up;

[0046] Figure 3 A schematic diagram of the structure of a sealing ring of a shield construction sealing system, which also shows a combined sealing device;

[0047] Figure 4 It is a partially enlarged schematic diagram of a combined sealing device of a shield construction sealing system;

[0048] Figure 5 for Figure 4 The structure shown is a schematic diagram of the structure when the first airbag sealing assembly is in a working state;

[0049] Figure 6 for Figure 4 The structure shown is a schematic diagram of the structure when the first airbag sealing assembly is in the stowed state;

[0050] Figure 7 for Figure 4 A schematic diagram of the structure of the first airbag sealing assembly of the structure shown when it is limited by the limiting member;

[0051] Figure 8 A schematic diagram of the structure of a pre-buried steel ring of a shield construction sealing system, which also shows a second airbag sealing assembly;

[0052] Fig. 9 for Figure 8 A partial enlarged schematic diagram of the structure shown;

[0053] Fig.10 It is a structural schematic diagram of a shield construction method when installing a shield construction sealing system for receiving;

[0054] Fig.11 It is a structural schematic diagram of a shield construction method when installing a shield construction sealing system in preparation for acceptance;

[0055] Fig.12 It is a structural schematic diagram of a shield construction method when the shield tunneling enters the sealing ring during the receiving process;

[0056] Fig.13 A schematic diagram of the structure of a shield construction method when the sealing cover is removed during the receiving process and the shield is pushed out of the sealing ring;

[0057] Fig.14 This is a structural schematic diagram of a shield construction method in which the shield tail leaves the station end wall and is injected with cement slurry for sealing during the receiving process.

[0058] Fig.15 It is a structural schematic diagram of a shield construction method when installing a shield construction sealing system for initial installation;

[0059] Fig.16 It is a structural schematic diagram of a shield construction method when installing a shield construction sealing system and preparing to start;

[0060] Fig.17 The schematic diagram of the structure of a shield construction method when the shield tail leaves the embedded steel ring during the initial start of the shield construction.

[0061] In the figure: 01-embedded steel ring; 011-inner ring; 012-main body; 013-outer ring; 014-second mounting groove; 02-second airbag sealing assembly; 021-second airbag; 022-second elastic sealing bag; 0221-connecting part; 03-airbag inflation pipeline; 04-second fastener; 05-pressing plate; 06-second blocking member; 07-station end wall; 08-tunnel;

[0062] 1-sealing ring; 11-first mounting groove; 2-first elastic sealing brush; 3-first airbag sealing assembly; 31-first elastic sealing bag; 311-bag portion; 312-bag opening edge; 313-perforation; 32-first airbag; 33-first pressing assembly; 331-pressing block; 332-annular mounting plate; 34-first blocking member; 35-limiting member;

[0063] 100-receiving assembly; 101-sealing cover; 200-starting assembly; 201-shield starting base; 202-reaction frame; 300-shield; 400-station end wall; 500-tunnel portal; 600-tunnel segment; 601-grouting hole; 700-solid sealing body. DETAILED DESCRIPTION

[0064] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0065] Combination Figure 1-8As shown, an embodiment of the present application provides a shield construction sealing system, which is used for receiving and / or launching a shield 300. The shield 300 can be received or launched by constructing a sealed channel through which the shield 300 can pass and simultaneously seal the gap between the shield 300 or the tunnel segment 600 and the channel.

[0066] In an embodiment of the present application, a shield construction sealing system of an embodiment of the present application may include an embedded steel ring 01, a sealing ring 1 coaxially connected to the embedded steel ring 01, a working component cooperating with the sealing ring 1, a combined sealing device arranged on the inner wall of the sealing ring 1, and a second airbag sealing component 02 arranged on the inner wall of the embedded steel ring 01.

[0067] Among them, the working component includes a receiving component 100 and / or a starting component 200; the receiving component 100 includes a sealing cover 101, and the sealing cover 101 is detachably arranged at the end of the sealing ring 1 away from the embedded steel ring 01, so that the embedded steel ring 01, the sealing ring 1 and the sealing cover 101 form a receiving channel with one end open and the other end closed; the starting component 200 includes a shield starting base 201 for supporting the shield 300 and a reaction frame 202 for providing reaction force for the shield 300. The working component is used to cooperate with the sealing ring 1 to receive or launch the shield 300. When it is received by the receiving component 100, the sealing cover 101 can seal the tail end of the sealing ring 1, and together with the embedded steel ring 01 and the sealing ring 1, form a receiving channel for the shield 300 to enter, and the sealing cover 101 can be removed. After the shield 300 basically enters the sealing ring 1, due to the multiple seals of the combined sealing device and the second airbag sealing component 02, the sealing cover 101 can be removed and the shield 300 can be moved out of the sealing ring 1 for shield 300 recovery; when it passes through the launching When component 200 is started, the shield starting base 201 can be used for the placement and assembly of the shield 300, and the reaction frame 202 can provide support for the advancement of the shield 300. In this way, after the shield 300 is assembled on the shield starting base 201, the shield 300 can be advanced by abutting against the reaction frame 202 through the negative ring segment or the tunnel segment 600, and then can move into the sealing ring 1 and the subsequent channel and finally enter the soil layer outside the station for excavation; the receiving component 100 and the starting component 200 can be configured according to construction requirements to receive or start the shield 300.

[0068] The combined sealing device may include an elastic sealing brush assembly and a first airbag sealing assembly 3, both of which are axially arranged on the circumferential inner wall of the sealing ring 1. The first airbag sealing assembly 3 includes a first elastic sealing bag 31, a first inflatable airbag 32 and a first pressing assembly 33. The first elastic sealing bag 31 made of elastic fiber material includes a bag portion 311 and a bag opening edge 312. The first airbag 32 is accommodated in the bag portion 311, and the bag opening edge 312 is pressed and fixed on the inner wall of the sealing ring 1 by the pressing assembly. The elastic sealing brush assembly is an elastic sealing component arranged on the inner side of the sealing ring 1, which can be elastically pressed against the outer wall of the shield 300 or the outer wall of the tunnel segment 600 for sealing. It can be a spring steel wire brush or a spring steel plate brush, and the first airbag sealing assembly 3 can further perform sealing. In combination with the elastic sealing brush assembly, multiple sealing can be achieved. The cross-section of the first elastic sealing bag 31 is a bag-like structure, but from the perspective of the overall unfolded form, it can be regarded as a ring-shaped strip-shaped component with a large width in the axial direction. After being pressed and fixed at both ends, namely the bag edge 312, by the first pressing component 33, it can be a bag-like structure. The bag portion 311 of the bag-like structure can accommodate an airbag. After the first airbag 32 is inflated, the first elastic sealing bag 31 can be expanded and opened synchronously with the expansion of the first airbag 32, so that the first elastic sealing bag 31 can be pressed against the outer wall of the shield 300 or the outer wall of the tunnel segment 600. The greater the internal air pressure, the greater the pressure and sealing force. In this way, more effective sealing can be achieved. It cooperates with the elastic sealing brush component to achieve a better sealing effect, avoiding the use of only a single sealing method such as an elastic sealing brush and a poor sealing effect. At the same time, the length of the annular sealing component can be shortened through a structure with better sealing effect and more effectiveness, thereby facilitating the reception or launch of the shield 300. By accommodating the first airbag 32 in a bag-like structure, it is also possible to facilitate sealing with a larger first airbag 32, making the sealing more effective. At the same time, by accommodating the first airbag 32 with the first elastic sealing bag 31, it is also possible to avoid the situation where the first airbag 32 is easily broken due to the use of fasteners to fix or connect the airbag. It is understandable that, in addition to being able to press against the outer wall of the tunnel segment 600 or the outer wall of the shield 300 by expanding, the first airbag sealing assembly 3 can also press against the elastic sealing brush, so that the elastic sealing brush can obtain a greater pressing force and cling to the outer wall of the shield 300 or the tunnel segment 600, especially for the situation where the gap between the sleeve annular sealing component and the outer wall of the shield 300 or the outer wall of the tunnel segment 600 is large, resulting in insufficient pressing force of the elastic sealing brush. At the same time, the way of sealing by the first elastic sealing bag 31 has a certain degree of mobility during the sealing process, and can better perform active sealing through the wear-resistant characteristics.

[0069] The second airbag sealing component 02 can adopt an airbag structure with a bag-shaped outer layer on the outside, which can be squeezed inward by expansion and pressed against the outer wall of the shield 300 or the tunnel segment 600. This expansion sealing method avoids the use of difficult-to-clean sealing components such as spring brushes, making cleaning more convenient and less costly. In addition, the second airbag sealing component 02 in the embedded steel ring 01 and the combined sealing device in the sealing ring 1 can cooperate with each other in air pressure to achieve a stepped air pressure seal, that is, a stepped sealing structure is achieved by controlling the size of the front and rear air pressures. For example, the first airbag sealing component 3 is configured to be low pressure, and the second airbag sealing component 02 is configured to be high pressure. In this way, a stepped sealing structure can be formed, which makes the sealing more controllable and easy to configure flexibly.

[0070] Through the above technical scheme, a combined sealing device is provided on the sealing ring 1 and a second airbag sealing assembly 02 is provided on the embedded steel ring 01, which can not only realize multiple sealings with different sealing methods and significantly improve the sealing effect, but also can effectively shorten the length of the sealing ring 1 through a better sealing structure. The working assembly can make the receiving and starting of the shield 300 more convenient and reduce the cost, and by accommodating the airbag in a bag-like manner, it can protect the airbag while expanding with the airbag, and can provide a larger expansion space for the airbag and accommodate airbags of larger sizes, thereby achieving a better sealing effect.

[0071] In one embodiment, a first mounting groove 11 is circumferentially provided on the inner wall of the sealing ring 1, and a bag opening edge 312 of the first elastic sealing bag 31 is pressed and fixed in the first mounting groove 11 by a first pressing assembly 33. When the first airbag sealing assembly 3 is switched to a working state by inflating the first airbag 32, the first elastic sealing bag 31 expands with the first airbag 32 and protrudes out of the first mounting groove 11 toward the inner side of the sealing ring 1 for sealing.

[0072] The first airbag sealing assembly 3 is installed in the first installation groove 11 on the inner wall of the sealing ring 1 through the first pressing assembly 33. The first installation groove 11 can reduce the size of the first airbag sealing assembly 3 protruding inward and facilitate the installation of a first airbag sealing assembly 3 of a larger size. Of course, in the embodiment without the first installation groove 11, a first airbag sealing assembly 3 of a relatively smaller size can also be installed. The first airbag sealing assembly 3 is deformed by the inflation and deflation of the first airbag 32, that is, the first airbag sealing assembly 3 can have a working state. In the working state, the first airbag sealing assembly 3 protrudes from the first installation groove 11 and is pressed and sealed against the outer wall of the shield 300 or the outer wall of the tunnel segment 600. At this time, there is a large pressure inside, and sealing is performed in this state. On the contrary, in the non-working state, no sealing is performed, and the first airbag sealing assembly 3 will be stored in the first installation groove 11.

[0073] Furthermore, in order to achieve a better sealing effect, the elastic sealing brush assembly and the first airbag sealing assembly 3 are provided with multiple groups, and at least one group of first airbag sealing assembly 3 is provided between every two adjacent groups of elastic sealing brush assemblies. The elastic sealing brush assembly is connected and installed with the first airbag sealing assembly 3 via an annular mounting plate 332 connected to the first pressing assembly 33.

[0074] In this way, by cross-arranging the elastic sealing brush assembly and the first airbag sealing assembly 3 along the axial direction of the sealing ring 1, the first airbag sealing assembly 3 can well seal the gap existing in the elastic sealing brush assembly, and the annular mounting plate 332 can facilitate the connection and installation of the elastic sealing brush and the first airbag sealing assembly 3 by being mainly arranged on the first pressing assembly 33, which is more conducive to effective sealing and improves the sealing coordination between them.

[0075] On this basis, the bag opening edges 312 of the first elastic sealing bags 31 of two adjacent groups of the first airbag sealing assemblies 3 are connected as one. By connecting the bag opening edges 312 of the first elastic sealing bags 31 of two adjacent groups of the first airbag sealing assemblies 3 as one, multiple groups of first airbag sealing assemblies 3 can share the elastic outer layer, that is, it is composed of a whole piece of a band-shaped component that is annular in shape and has a large width in the axial direction from the overall unfolded form, and is formed by inwardly concavely setting a plurality of first elastic sealing airbags distributed along the axial direction at the position corresponding to each group of first airbag sealing assemblies 3, and the adjacent bag opening edges 312 are an integrated structure, which can not only facilitate the installation of multiple groups of first airbag sealing assemblies 3, but also reduce costs.

[0076] In a preferred implementation structure of the first pressing component 33, the first pressing component 33 includes a first pressing block 331 and a first fixing member (not shown in the figure), the first fixing member is arranged in the first mounting groove 11 and presses the bag opening edge 312 of the first elastic sealing bag 31, the first fixing member fixes the first pressing block 331 in the first mounting groove 11, and the annular mounting plate 332 can be installed on the pressing block 331.

[0077] The first pressing assembly 33 is provided with a group of pressing and holding at the bag edge 312 on both sides of the first elastic sealing bag 31, and the first pressing block 331 is used to press the bag edge 312 of the first elastic sealing bag 31 to prevent the bag edge 312 from being pulled apart when the first airbag 32 expands. The first fixing member such as a bolt can make the first pressing block 331 have a pressing force and stably fix the first pressing block 331 in the first installation groove 11 for pressing and holding. Such an installation structure can facilitate the replacement of the first airbag sealing assembly 3, and is convenient for use and maintenance.

[0078] Specifically, the first fixing member may be installed by using a countersunk structure to facilitate the installation of the annular mounting plate 332 on the first pressing block 331 .

[0079] In order to enable the first elastic sealing bag 31 to be pressed more firmly, the bag mouth edge 312 has an edge extension portion that is not pressed by the first pressing assembly 33, and the edge extension portion is provided with a through hole 313. The through hole 313 is sleeved with a limiting member 35, and the limiting member 35 forms a limiting relationship with the first pressing assembly 33 in a first direction parallel to the axial direction of the sealing ring 1.

[0080] In this way, by passing a limiting member 35 such as a limiting rod through the through hole 313 of the bag edge 312, when the first airbag 32 expands, the bag edge 312 is limited by the limiting member 35 and the first pressing block 331, which can provide an opposite resistance to the bag edge 312, thereby better preventing the bag edge 312 from being stretched out by the first airbag 32, and making the structure more stable.

[0081] In the specific implementation process, the first elastic sealing bag 31 can be made of elastic fiber material. The first elastic sealing bag 31 made of elastic fiber material can have good elasticity and expand with the expansion of the first airbag 32, and can also have good wear resistance by using materials such as polyolefin fiber, nylon fiber or polyester fiber, so that it can be pressed against the surface of the shield 300 or the surface of the tunnel segment 600 for sealing. This type of fiber is soft and has good tensile strength, is easy to install, and has low requirements for installation space. The first elastic sealing bag 31 can be spliced ​​and manufactured on site, and has high strength. The pressure of the first airbag 32 can be adjusted to a higher level, so that the sealing ability of the receiving or launching system of the entire shield 300 is stronger.

[0082] In order to achieve better storage of the first airbag sealing assembly 3 in the non-working state, in an embodiment of the present application, a first blocking member 34 is further provided on the inner side of the sealing ring 1 to cover the first airbag sealing assembly 3 to prevent it from freely falling inward, and the first blocking member 34 can be broken or opened by the first airbag sealing assembly 3.

[0083] The first airbag sealing assembly 3 can be blocked in the first installation groove 11 by the blocking of the first blocking member 34 in the non-working state, so that the shield 300 can pass better and the construction is convenient. Specifically, the first blocking member 34 is preferably made of a rubber material with a relatively thin thickness, and the two ends of the first blocking member 34 can be respectively fixed on the first pressing block 331 or the annular mounting plate 332 by first fasteners such as bolts. When the first blocking member 34 is configured to be opened by the first airbag sealing assembly 3, one of its two ends is simply fixed, such as fixed by bolts, so that the first blocking member 34 can fall off and open when the first airbag 32 expands. When the first blocking member 34 is configured to be broken by the first airbag sealing assembly 3, its thickness is relatively thin and can be broken by the expansion of the first airbag sealing assembly 3. At this time, the first airbag sealing assembly 3 can break out and be pressed against the outer wall of the shield 300 or the tunnel segment 600.

[0084] Furthermore, when the first airbag 32 is in the uninflated storage state, the first elastic sealing bag 31 and the first airbag 32 therein are folded in the first installation groove 11 in a concave-convex fit with each other.

[0085] In this way, the folded first elastic sealing bag 31 and the first airbag 32 can reduce the volume and space occupied, so that it is convenient to set up a larger-sized first airbag sealing assembly 3. In the specific implementation process, the first elastic sealing section and the first airbag 32 therein can be folded in a wavy concave-convex structure, so that a larger-sized first airbag sealing assembly 3 can be stored.

[0086] In addition, the first elastic sealing brush 2 is preferably a spring steel plate brush made of multiple layers of steel plates. In the past, the sleeve or the extended steel ring was sealed with a wire brush. This sealing method consumes a lot of tail brushes, and it is difficult to clean the wire brush after the cement slurry enters the inside of the wire brush. After the combination sealing method of the spring steel plate brush made of multiple layers of steel plates and the first airbag sealing component 3 is adopted, the steel plate brush can be easily cleaned and the sealing effect is better.

[0087] In an embodiment of the present application, the second airbag sealing assembly 02 includes a second elastic sealing bag 022, an inflatable second airbag 021 and a second pressing assembly. The second elastic sealing bag 022 made of elastic fiber material accommodates the second airbag 021, and the bag opening edge 312 of the second elastic sealing bag 022 is pressed and fixed to the inner wall of the embedded steel ring 01 by the second pressing assembly.

[0088] The second airbag sealing component 02 can also achieve better sealing through a structure basically the same as the first airbag 32 component. The second airbag 021 is accommodated in a second elastic sealing bag 022, and the bag edge 312 of the second elastic sealing bag 022 is pressed by a second pressing component to fix the second elastic sealing bag 022. The second elastic sealing bag 022 expands with the expansion of the second airbag 021. The second elastic sealing bag 022 can be pressed against the outer wall of the shield 300 or the outer wall of the fake tunnel segment 600 by expansion, thereby achieving sealing.

[0089] Furthermore, the embedded steel ring 01 is provided with a second installation groove 014, and the second airbag sealing assembly 02 is connected in the second installation groove 014. The inner side of the embedded steel ring 01 is also provided with a second blocking member 06 covering the second airbag sealing assembly 02 to prevent it from freely falling inward, and the second blocking member 06 can be broken or opened by the second airbag sealing assembly 02.

[0090] By constructing a second installation groove 014 on the inner wall of the embedded steel ring 01, the second installation groove 014 can provide an installation space for the second airbag 021 assembly, so that the second airbag 021 assembly will not protrude too much toward the inner side of the embedded steel ring 01, and cooperate with the second blocking member 06 to block the free fall of the second airbag 021 assembly when it is not expanded, so that it is constrained on the inner side of the second blocking member 06, so that the second airbag 021 assembly can be kept in a stored state, which is more convenient for the passage of the shield 300. Since the second airbag 021 will expand, the second blocking member 06 is configured to be broken or opened by the second airbag 021 assembly. After breaking the second blocking member 06, the second airbag 021 assembly is pressed against the outer wall of the shield 300 or the outer wall of the tunnel segment 600 to achieve sealing, which can avoid the problem of manual disassembly.

[0091] In the specific implementation process, the sealing ring 1 includes an inner ring portion 011, a main body portion 012 and an outer ring portion 013 arranged in the axial direction. The inner ring surface diameter of the main body portion 012 is larger than the inner ring surface diameter of the inner ring portion 011 and smaller than the outer diameter of the outer ring portion 013. The main body portion 012 is formed with a stepped second installation groove 014. The free end of the second airbag sealing assembly 02 in a free state extends out of the second installation groove 014 and is pressed against the inner wall of the inner ring portion 011 by the second blocking member 06. The embedded steel ring 01 of such a structure can form the second installation groove 014 to facilitate the installation of the second airbag sealing assembly 02, and can also retain the main parts of the embedded steel ring 01, namely the inner ring portion 011 and the outer ring portion 013. The inner ring portion 011 can facilitate the passage of the shield 300, while the outer ring portion 013 is convenient for connection with other components. Specifically, the outer ring portion 013 is a flange connection portion 0221 used to connect external components such as a steel sleeve to receive or initiate the shield 300.

[0092] Accordingly, the free end of the second airbag sealing assembly 02 in the free state extends out of the second mounting groove 014 and is pressed against the inner wall of the inner ring portion 011 by the second blocking member 06. Since the space of the second mounting groove 014 is limited, the free end of the second airbag sealing assembly 02 is pressed against the inner wall of the inner ring portion 011 by the second blocking member 06 in the direction of the inner ring portion 011, and can be constrained while facilitating the passage of the shield 300.

[0093] Specifically, the second blocking member 06 is preferably made of a thin rubber material, and one end of the second blocking member 06 is fixed to the inner ring portion 011 by a second fastener 04 such as a bolt, and the other end is held and fixed by the second holding assembly. When the second blocking member 06 is configured to be opened by the second airbag sealing assembly 02, one of its two ends is simply fixed, such as fixed by a bolt, so that the second blocking member 06 can fall off and open when the second airbag 021 expands. When the second blocking member 06 is configured to be broken by the second airbag sealing assembly 02, its thickness is relatively thin and can be broken by the expansion of the second airbag sealing assembly 02. At this time, the second airbag sealing assembly 02 can break out and be pressed against the outer wall of the shield 300 or the tunnel segment 600.

[0094] In the specific implementation process, the first airbag 32 and the second airbag 021 are respectively fed in and out through air nozzles, and each air nozzle is connected to an external pressurizing device through an airbag inflation pipeline 03. The pressurizing device is connected to the first airbag 32 or the second airbag 021 through the airbag inflation pipeline 03 to inflate and deflate the first airbag 32 or the second airbag 021, and the pipeline is configured to extend outward through the annular member to connect to a pressurizing device such as an air pump.

[0095] An embodiment of the present application also provides a shield 300 construction method, based on a shield construction sealing system such as any of the above-mentioned technical solutions, including a shield 300 receiving construction method and / or a shield 300 starting construction method.

[0096] Please refer to Figure 10-14 As shown, the shield receiving construction method comprises the following steps:

[0097] Step A11: Install the embedded steel ring 01 in the door 08 of the station end wall 07, and reserve the airbag inflation pipeline 03 of the second airbag sealing assembly 02;

[0098] Step A12: Install the second airbag sealing assembly 02 in the embedded steel ring 01, connect the second airbag 021 air nozzle of the second airbag sealing assembly 02 to the airbag inflation pipeline 03, and the second airbag 021 assembly is blocked by the second blocking member 06 in the second installation groove 014;

[0099] Step A13: coaxially installing the sealing ring 1 equipped with the receiving assembly 100 on the embedded steel ring 01 through the transition ring, and closing the tail end of the sealing ring 1 through the sealing cover 101 of the receiving assembly 100;

[0100] Step A13: installing the first airbag sealing assembly 3 and the elastic sealing brush assembly in the sealing ring 1, and the first elastic sealing bag 31 and the first airbag 32 of the first airbag sealing assembly 3 are blocked in the first installation groove 11 by the first blocking member 34;

[0101] Step A14: Install a support frame on the rear side of the sealing cover 101, the support frame is connected to the sealing cover 101 to support the sealing member;

[0102] Step A15: Fill the sealing member with a protective medium such as thick bentonite slurry, clay effect, shield mud, thick mud, etc., to prepare for the shield machine 300 to receive it;

[0103] Step A16: After the shield 300 is excavated into the sealing ring 1, the second airbag sealing assembly 02 and the first airbag sealing assembly 3 are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing assembly 3 and the second airbag sealing assembly 02 are pressed against the outer wall of the shield 300 for sealing;

[0104] Step A17: Connect and install the receiving base of the shield 300 at the rear side of the sealing cover 101;

[0105] Step A18: the shield machine 300 continues to advance and when the shield machine 300 advances to a position close to the sealing cover 101, the sealing cover 101 is removed and the shield machine 300 is controlled to continue to advance;

[0106] Step A19: When the shield machine 300 advances to the receiving base of the shield machine 300 and leaves the station portal 08 area, cement slurry is injected through the grouting holes 601 on the tunnel segments 600. After the cement slurry solidifies, a solid sealing body is formed to block mud and water outside the station from entering the station.

[0107] Step A20: The shield 300, the receiving assembly 100 and the sealing ring 1 are removed, and the receiving of the shield 300 is completed.

[0108] Please refer to Figure 15-17 As shown, the shield construction method may include the following steps:

[0109] Step B11: Install the embedded steel ring 01 on the station end wall 07, and reserve the airbag inflation pipeline 03 of the second airbag sealing assembly 02;

[0110] Step B12: Install the second airbag sealing assembly 02 in the embedded steel ring 01, connect the second airbag 021 air nozzle of the second airbag sealing assembly 02 to the airbag inflation pipeline 03, and the second airbag 021 assembly is pressed against the inner wall of the embedded steel ring 01 by the second blocking member 06;

[0111] Step B13: coaxially installing the sealing ring 1 equipped with the starting assembly 200 on the embedded steel ring 01 through the transition ring;

[0112] Step B14: installing the first airbag sealing assembly 3 and the elastic sealing brush assembly in the sealing ring 1, and the first elastic sealing bag 31 and the first airbag 32 of the first airbag sealing assembly 3 are blocked in the first installation groove 11 by the first blocking member 34;

[0113] Step B15: Install the shield starting base 201 and the reaction frame 202 on the rear side of the sealing ring 1, assemble the shield 300 on the shield starting base 201, and assemble the tunnel segment 600 between the shield 300 and the reaction frame 202;

[0114] Step B16: When the shield 300 is pushed into the embedded steel ring 01, the second airbag sealing component 02 and the first airbag sealing component 3 are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing component 3 and the second airbag sealing component 02 are pressed against the outer wall of the shield 300 for sealing;

[0115] Step B17: The shield machine 300 starts to move until it leaves the tunnel portal 08 area of ​​the station. At the same time, cement slurry is injected through the grouting holes 601 on the tunnel segments 600. After the cement slurry solidifies, a solid seal is formed to block the mud and water outside the station from entering the station. The start is completed.

[0116] In addition, the shield receiving construction method can also be combined with the piston component in the patent No. 202411257417.6 applied by the applicant and named as a shield receiving system and receiving method. Unlike the aforementioned shield receiving construction method, the system does not need to set up an elastic sealing brush assembly, and the piston component is installed in the sealing ring 1, and the sealing cover 101 is set at the tail end of the piston component, and a support frame is installed on the rear side of the sealing cover 101. The support frame is connected to the sealing cover 101 to support the whole, and then the sealing ring 1 and the piston component are filled with slag and water. Mud mortar, solidified soil and other media are prepared for the shield 300 to receive. After the shield 300 advances into the piston component and pushes the piston component into the sealing ring 1, the second airbag sealing component 02 and the first airbag sealing component 3 are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing component 3 and the second airbag sealing component 02 are pressed against the outer wall of the shield 300 for sealing; then, the shield receiving base is connected and installed on the rear side of the sealing cover 101, and the shield continues to advance and pushes the piston component onto the shield receiving base for disassembly and assembly, so that the shield can also be received.

[0117] The above-mentioned shield 300 receiving construction method and shield 300 starting construction method have the following advantages:

[0118] 1. The existing station structure is fully utilized to set up the airbag sealing structure. With the sealing ring 1 and the working assembly, the starting sleeve or the receiving sleeve can be shortened to a very short length, which greatly simplifies the starting and receiving process flow of the shield 300, provides stronger sealing capability, and greatly improves safety.

[0119] 2. Through the first airbag sealing assembly 3, the first airbag 32 in the sealing ring 1 can be set to a low pressure, and the second airbag 021 in the embedded steel ring 01 can be set to a high pressure, forming a stepped sealing structure.

[0120] 3. The first airbag sealing assembly 3 and the second airbag sealing assembly 02 are easy to install, have high strength, and have low requirements for installation space; for a large-diameter shield 300, the workpiece inside the sealing ring 1 is relatively large, and easily found materials such as conveyor belts can be used to make elastic sealing bags. The joints can be made on-site, and the joints have high strength. Such elastic sealing bags can withstand higher pressures, and the pressure of the internal airbags can be adjusted to a higher level, thereby making the sealing ability of the embedded steel ring 01 and the sealing ring 1 stronger.

[0121] 4. An airbag seal is set inside the sealing ring 1 and the embedded steel ring 01. Due to the restriction of the material of the sealing ring 1, the inflation pressure of the airbag cannot be too high. When the airbag pressure is too high, the bolts used to fix the airbag may not be able to withstand the pressure and be damaged. Therefore, if the airbag is directly set, the airbag pressure will be low and cannot provide a relatively high sealing ability. After the airbag is set inside the station portal 08 and the outer tire structure with elastic sealing bag is set, as long as the strength of the outer tire is large enough, the inner tire pressure can be adjusted to a very high level, such as 20 Pa or even higher. Because the reinforced concrete structure of the station end wall 07 can also be regarded as a part of the outer tire structure, the high pressure of the inner tire can ensure that the outer tire is stretched open and pressed against the shield 300 or the tunnel segment 600, thereby providing sufficient contact pressure.

[0122] 5. In the past, short sleeves or extended steel rings were sealed with wire brushes. This sealing method consumes a lot of tail brushes. After cement slurry enters the wire brush, it is difficult to clean the wire brush. After the spring steel plate brush and airbag combination sealing method is adopted, the spring steel plate brush can be easily cleaned. You only need to replace the airbag and the outer jacket of the airbag each time, which can significantly reduce the cost of use. In addition, the spring steel plate brush is made of multiple layers of steel plates, which is easy to adjust on site. If you need to increase the elasticity of the spring steel plate, you can install more spring steel plate brushes, which is easy to adjust.

[0123] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A shield construction sealing system, characterized in that: include: Embedded steel ring; A sealing ring coaxially connected to the embedded steel ring; A working assembly matched with the sealing ring, the working assembly includes a receiving assembly and / or a starting assembly; the receiving assembly includes a sealing cover, the sealing cover is detachably arranged at the end of the sealing ring away from the embedded steel ring, so that the embedded steel ring, the sealing ring and the sealing cover form a receiving channel with one end open and the other end closed; the starting assembly includes a shield starting base for carrying the shield and a reaction frame for providing reaction force for the shield; A combined sealing device, the combined sealing device comprising an elastic sealing brush assembly and a first airbag sealing assembly both axially arranged on the circumferential inner wall of a sealing ring, the first airbag sealing assembly comprising a first elastic sealing bag, a first inflatable and deflable airbag and a first pressing assembly, the first elastic sealing bag made of an elastic fiber material comprising a bag portion and a bag opening edge, the first airbag being accommodated in the bag portion, and the bag opening edge being pressed and fixed to the inner wall of the sealing ring by the pressing assembly; and A second airbag sealing assembly is arranged on the inner wall of the embedded steel ring.

2. A shield construction sealing system as claimed in claim 1, characterized in that: The inner wall of the sealing ring is circumferentially provided with a first mounting groove, and the edge of the bag opening of the first elastic sealing bag is pressed and fixed in the first mounting groove by a first pressing assembly. When the first airbag sealing assembly is switched to a working state by inflating the first airbag, the first elastic sealing bag protrudes from the first mounting groove toward the inner side of the sealing ring for sealing as the first airbag expands.

3. A shield construction sealing system as claimed in claim 2, characterized in that: The elastic sealing brush assembly and the first airbag sealing assembly are both provided with multiple groups, and at least one group of the first airbag sealing assembly is provided between every two adjacent groups of the elastic sealing brush assembly. The elastic sealing brush assembly is connected and installed with the first airbag sealing assembly via an annular mounting plate connected to the first holding assembly.

4. A shield construction sealing system as claimed in claim 3, characterized in that: The bag opening edges of the first elastic sealing bags of two adjacent groups of the first airbag sealing assemblies are integrally connected.

5. A shield construction sealing system as claimed in claim 1, characterized in that: The edge of the bag opening has an edge extension portion that is not held by the first holding assembly. The edge extension portion is provided with a through hole. A limiting member is provided through the through hole. The limiting member forms a limiting relationship with the first holding assembly in a first direction parallel to the axial direction of the sealing ring.

6. A shield construction sealing system as claimed in claim 1, characterized in that: The inner side of the sealing ring is also provided with a first blocking member covering the first airbag sealing assembly to prevent it from freely falling inward, and the first blocking member can be broken or opened by the first airbag sealing assembly.

7. A shield construction sealing system as claimed in claim 6, characterized in that: When the first airbag is in an uninflated storage state, the first elastic sealing bag and the first airbag therein are folded in the first installation groove in a concave-convex fit with each other.

8. A shield construction sealing system as claimed in claim 1, characterized in that: The second airbag sealing assembly includes a second elastic sealing bag, an inflatable second airbag and a second pressing assembly. The second elastic sealing bag made of elastic fiber material accommodates the second airbag, and the edge of the bag opening of the second elastic sealing bag is pressed and fixed on the inner wall of the embedded steel ring by the second pressing assembly.

9. A shield construction sealing system as claimed in claim 1, characterized in that: The embedded steel ring is provided with a second installation groove, and the second airbag sealing assembly is connected in the second installation groove. The inner side of the embedded steel ring is also provided with a second blocking member that covers the second airbag sealing assembly to prevent it from freely falling inward, and the second blocking member can be broken or opened by the second airbag sealing assembly.

10. A shield construction sealing system as claimed in claim 9, characterized in that: The embedded steel ring includes an inner ring portion, a main body portion and an outer ring portion arranged along the axial direction, the inner ring surface diameter of the main body portion is larger than the inner ring surface diameter of the inner ring portion and smaller than the outer diameter of the outer ring portion, the main body portion is formed with a stepped second mounting groove, and the free end of the second airbag sealing assembly in a free state extends out of the second mounting groove and is pressed against the inner wall of the inner ring portion by the second blocking member.

11. A shield construction method, based on the shield construction sealing system according to any one of claims 1 to 10, characterized in that: Including shield receiving construction method and / or shield starting construction method: The shield receiving construction method comprises the following steps: Install embedded steel rings on the station end wall and reserve the airbag inflation pipeline for the second airbag sealing assembly; Install the second airbag sealing assembly in the embedded steel ring, connect the second airbag air nozzle of the second airbag sealing assembly to the airbag inflation pipeline, and the second airbag assembly is blocked in the second installation groove by the second blocking member; A sealing ring matched with a receiving assembly is coaxially installed on the embedded steel ring through a transition ring, and the tail end of the sealing ring is closed by a sealing cover of the receiving assembly; A first airbag sealing assembly and an elastic sealing brush assembly are installed in the sealing ring, and a first elastic sealing bag and a first airbag of the first airbag sealing assembly are blocked in the first mounting groove by a first blocking member; A support frame is installed on the rear side of the sealing cover, and the support frame is connected to the sealing cover to support the sealing component; Fill the sealing component with excavation protection medium to prepare for the shield to receive it; After the shield tunneling enters the sealing ring, the second airbag sealing assembly and the first airbag sealing assembly are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing assembly and the second airbag sealing assembly are pressed against the outer wall of the shield for sealing; Connect and install the shield receiving base on the rear side of the sealing cover; The shield machine continues to advance and when it advances to a position close to the sealing cover, the sealing cover is removed and the shield machine is controlled to continue to advance; When the shield machine is advanced to the shield receiving base and leaves the station portal area, cement slurry is injected through the grouting holes on the tunnel segments. After the cement slurry solidifies, a solid seal is formed to block mud and water outside the station from entering the station. The shield, receiving components and sealing rings are removed, and the shield receiving is completed; The shield construction method comprises the following steps: Install embedded steel rings on the station end wall and reserve the airbag inflation pipeline for the second airbag sealing assembly; Install a second airbag sealing assembly in the embedded steel ring, connect the second airbag air nozzle of the second airbag sealing assembly to the airbag inflation pipeline, and hold the second airbag assembly on the inner wall of the embedded steel ring by the second blocking member; A sealing ring matched with the starting assembly is coaxially installed on the embedded steel ring through a transition ring; A first airbag sealing assembly and an elastic sealing brush assembly are installed in the sealing ring, and a first elastic sealing bag and a first airbag of the first airbag sealing assembly are blocked in the first mounting groove by a first blocking member; Install the shield starting base and reaction frame on the rear side of the sealing ring, assemble the shield on the shield starting base and assemble the tunnel segments between the shield and the reaction frame; When the shield is advanced into the embedded steel ring, the second airbag sealing component and the first airbag sealing component are inflated and the air pressure is adjusted to a preset pressure value, so that the first airbag sealing component and the second airbag sealing component are pressed against the outer wall of the shield for sealing; The shield machine starts to move until it leaves the tunnel portal area of ​​the station. At the same time, cement slurry is injected through the grouting holes on the tunnel segments. After the cement slurry solidifies, a solid seal is formed to block the mud and water outside the station from entering the station, and the start is completed.

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