Shield launching receiving system and shield receiving method

Abstract

The invention belongs to the technical field of shield construction, and discloses a shield launching receiving system and a shield receiving method.On the basis of a traditional sleeve, flange connecting parts are moved backwards by a certain distance, and mounting grooves can be formed between first connecting parts of adjacent sleeve components and between sleeves; each mounting groove can be provided with the corresponding connecting assembly, effective sealing and pressure resistance under the shield construction environment with the high water pressure can be achieved through additional connection of the connecting assemblies and sealing connection in a matched mode, the structural strength of the connecting positions between components is improved, and the safety of shield receiving or starting construction is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of shield construction, and in particular relates to a shield launching and receiving system and a shield receiving 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 a shield is started and taken over, 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 take over 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 being adopted for groundwater extraction. Therefore, precipitation construction is generally not allowed during the start and take over period of the shield, which makes the control of groundwater during the start and take over period of the shield increasingly difficult.

[0003] In the existing technology, steel sleeve technology is being widely used for the launching and receiving of shield machines. The steel sleeve is generally divided into sections of 2 meters, and flanges are provided between each section of the steel sleeve. Rubber gaskets or rubber sealing strips are filled between the flanges to seal, and the flanges are connected with bolts. After the bolts are tightened, the rubber sealing strips or sealing plates are squeezed to achieve the purpose of water stopping. At the same time, each section of the steel sleeve is generally divided into 2 or more blocks according to the size of the steel sleeve. Flanges and rubber gaskets or rubber strips are also provided between each block for sealing. This traditional sealing and force-bearing structure can meet the use requirements when the steel sleeve needs to withstand a relatively low pressure (for example, less than 3 bar pressure). However, if the steel sleeve is required to meet a pressure of 4 bar or even higher, this flange + sealing gasket (ring) + bolt structure is difficult to meet the on-site use requirements. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a shield launching and receiving system and a shield receiving method to solve the problem in the prior art that traditional sleeve receiving is insufficient to cope with high water pressure construction environment.

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

[0006] In one aspect, a shield launching and receiving system is provided, comprising a sleeve assembly and an end cap, wherein the end cap closes one end of the sleeve assembly;

[0007] The sleeve assembly includes several sections of sleeves for receiving or launching shield machines and an axial connection assembly connecting two adjacent components. The sleeve includes several components for connecting to each other to form the sleeve. The components are arc-shaped. The components are provided with a connecting portion 1 on the outer wall of the end portion connected to the adjacent components. The connecting portions 1 of the two adjacent components are spaced to form a mounting groove 1. The axial connection assembly is arranged in the mounting groove 1. The axial connection assembly includes several reinforcing connection members 1. The reinforcing connection member 1 is provided with a connecting portion 2 connecting the connecting portions 1 on both sides of the mounting groove 1.

[0008] Several sections of the sleeve are connected axially by an annular connecting assembly. The sleeve components are provided with a connecting portion 3 on the outer wall of the end portion connected to the adjacent sleeve components. An installation groove 2 for installing the annular connecting assembly is formed between the connecting portions 3 of two adjacent sleeve components. The annular connecting assembly includes a reinforcing connecting member 2, and the reinforcing connecting member 2 is provided with a connecting portion 4 connecting the connecting portions 3 on both sides of the installation groove 2.

[0009] The ends of two adjacent components and the sleeves are sealed and connected.

[0010] In a possible implementation, the connection part 1, the connection part 2, the connection part 3 and the connection part 4 are all flange structures.

[0011] In a possible implementation, the reinforcing connection member 1 and the reinforcing connection member 2 are both groove-type members, the sides of the reinforcing connection member 1 are configured as the connection part 2, and the sides of the reinforcing connection member 2 are configured as the connection part 4.

[0012] In a possible implementation, the bottoms of the first and second reinforcing connecting members are each provided with a first connecting hole, the end of the component is provided with a second connecting hole corresponding to the first connecting hole, and the second connecting hole is connected to the first connecting hole via a fastener;

[0013] And / or, two adjacent reinforcing connection members 1 or 2 are connected by fasteners.

[0014] In a possible implementation, the second mounting groove is communicated with the first mounting groove, and the first reinforcing connection member is connected to the second reinforcing connection member to form an external reinforcement skeleton.

[0015] In a possible implementation, the components are welded and sealed, or a sealing component covering the gap between adjacent components and pressed by the axial connection assembly or the annular connection assembly is provided on the outer wall of the component to form a sealed connection.

[0016] In a possible implementation, the outer periphery of the end cover is provided with a connecting portion five distributed along the circumferential direction, and a mounting groove three for installing an annular connecting component is formed between the connecting portion five and the connecting portion three of the enclosed sleeve. The mounting groove three is connected to the mounting groove one, and the annular connecting component is arranged in the mounting groove and the sleeve and the end cover are connected through the annular connecting component, and the end cover and the sleeve are sealed.

[0017] In a possible implementation, the third installation slot is communicated with the first installation slot, and the second reinforcing connection member in the third installation slot is connected to the first reinforcing connection member in the first installation slot.

[0018] In a possible implementation, the outer wall of the component is provided with a plurality of reinforcing ribs distributed transversely and longitudinally, or the outer wall of the sleeve is provided with a lateral support member, and the bottom end of the lateral support member is provided with a flange structure.

[0019] On the other hand, a shield receiving method is also provided, which is a shield starting receiving system based on any of the above technical solutions, comprising the following steps:

[0020] Preliminarily assemble a sleeve assembly of corresponding length according to the required length in the tunnel axial direction, and install the end cap to seal the end of the sleeve assembly;

[0021] Connect and fix the assembled sleeve assembly to the embedded steel ring of the station portal through the transition ring;

[0022] An external support is provided to connect the sleeve assembly and the end cover to form a rigid whole;

[0023] Starting from one end of the sleeve assembly near the station portal, the axially extending reinforcing connection member 1 and the circumferentially extending reinforcing connection member 2 are removed in sequence, and then a sealing connection is made between two adjacent components on the sleeve and between two adjacent sleeves. After the sealing connection is made, the reinforcing connection member 1 and the reinforcing connection member 2 are reinstalled; the sealing connection is performed in different ways depending on the water pressure. Under a first water pressure condition, welding sealing is used. Under a second water pressure condition lower than the first water pressure, a rubber pad is pressed under the reinforcing connection member 1 or the reinforcing connection member 2 to seal the gap between the components;

[0024] In the bottom area of ​​the sleeve assembly, the components and the sleeve are connected by a sealing method of welding from the inside;

[0025] Carry out water pressure test on the assembled sleeve and repair the parts that do not meet the pressure requirements until they meet the pressure requirements;

[0026] Backfill the excavation medium into the sleeve and prepare for the shield to receive it.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The shield starting and receiving system and shield receiving method of the present invention, by moving the flange connection part back a certain distance on the basis of the traditional sleeve, can form installation grooves between the connection parts of adjacent sleeve components and between sleeves. Each installation groove can be installed with a corresponding connection component respectively. Through the additional connection and sealing connection of the axial connection component and the annular connection component, effective sealing and pressure resistance can be achieved in a shield construction environment with higher water pressure, thereby improving the structural strength of the connection between the components and ensuring the safety of shield receiving or starting construction.

[0029] Moreover, by connecting the axial connection component and the annular connection component into one, an external reinforcement skeleton can be formed on the outside of the sleeve. This skeleton can significantly improve the structural strength and sealing of the sleeve after connection, thereby making it more adaptable to the shield construction environment with higher water pressure.

[0030] At the same time, the end cover and the sleeve are also configured with the same reinforced connection structure, which can further improve the sealing and connection strength of the end, making the overall structure and sealing better, and the structural design is reasonable and effective.

[0031] In addition, different sealing connection methods can be adopted according to different pressure conditions, which is more convenient and flexible, and the sealing is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a cross-sectional schematic diagram of the installation structure of the existing steel sleeve;

[0033] Figure 2 A front view of a sleeve of a sleeve assembly of a shield launching and receiving system;

[0034] Figure 3 A partial schematic diagram of the connection between sleeve components of a shield launching and receiving system;

[0035] Figure 4 A three-dimensional view of a reinforced connecting component 1 of a shield launching and receiving system;

[0036] Figure 5 A three-dimensional view of a second reinforcing connecting member of a shield launching and receiving system;

[0037] Figure 6 A cross-sectional view of a sleeve assembly of a shield launching and receiving system;

[0038] Figure 7 for Figure 6 An enlarged schematic diagram of section A, showing a weld seal;

[0039] Figure 8 for Figure 7 Schematic diagram of part A when it is sealed with a gasket;

[0040] Figure 9 The figure is a schematic diagram of the structure of a shield launching and receiving system when lateral supports are installed;

[0041] Figure 10 for Figure 8 The schematic diagram of the structure shown when it is installed on site;

[0042] Figure 11 This is a schematic diagram of the installation principle of the end cover of a shield launching and receiving system;

[0043] Figure 12 This is a schematic diagram of a shield machine launching and receiving system when receiving the shield machine after installation.

[0044] In the figure: 1-sleeve; 11-constituent part; 111-connection part three; 112-connection part one; 12-axial connection assembly; 121-reinforced connection member one; 1211-connection part two; 1212-connection hole one; 13-annular connection assembly; 131-mounting groove two; 132-reinforced connection member two; 1321-connection part four; 14-fastener; 15-welding seal; 16-sealing component; 17-support connection part one; 19-end cover; 191-connection part five; 192-support connection part two; 110-mounting groove one; 120-reinforcement rib plate; 2-support leg one; 3-transition ring; 4-embedded steel ring; 5-shield; 6-support leg two; 7-steel sleeve. DETAILED DESCRIPTION

[0045] 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.

[0046] Please refer to Figure 1 As shown, the steel sleeve 7 is usually installed on the embedded steel ring 4 of the station portal through the transition ring 3, and the embedded steel ring 4, the transition ring 3 and the steel sleeve 7 are fixed by the flanges at the ends. The flange is an annular plate-shaped connection structure extending outward, and the flanges can be connected by bolts. The steel sleeve 7 is generally divided into sections of 2 meters, and flanges are set between each section of the steel sleeve 7. After the flanges are filled with rubber sealing pads or rubber sealing strips for sealing, the flanges are connected by bolts. After the bolts are tightened, the rubber sealing strips or sealing plates are squeezed to achieve the purpose of water stopping. At the same time, each section of the steel sleeve 7 is generally divided into two or more pieces according to the size of the steel sleeve 7. Flanges and rubber pads or rubber strips are also set between each piece for sealing. This traditional sealing and force-bearing structure can meet the use requirements when the steel sleeve 7 needs to withstand a lower pressure (for example, less than 3 bar pressure). However, if the steel sleeve 7 is required to meet 4 bar or even higher pressure, there will be a large pressure at the flange connection between the steel sleeves 7 and between each component of the steel sleeve 7. This flange + sealing gasket (ring) + bolt structure is difficult to meet the on-site use requirements.

[0047] To solve the above technical problems, please refer to Figure 2-6 As shown, an embodiment of the present application provides a shield 5 launching and receiving system, including a sleeve 1 assembly and an end cover 19, wherein the end cover 19 closes one end of the sleeve 1 device.

[0048] The sleeve 1 assembly is a pressure-bearing sleeve 1, which is mainly suitable for shield 5 receiving or starting construction under higher water pressure conditions. It can form a channel for shield 5 receiving or starting through the end cover 19.

[0049] In an embodiment of the present application, the sleeve 1 assembly may include several sleeves 1 for receiving or launching the shield 5 and an axial connection assembly 12 connecting two adjacent components 11. The sleeve 1 includes several components 11 for connecting to each other to form a sleeve 1. The components 11 are arc-shaped. The component 11 is provided with a connecting portion 112 on the outer wall of the end connected to the adjacent component 11, and an installation groove 110 is formed between the connecting portions 112 of the two adjacent components 11; the axial connection assembly 12 is arranged in the installation groove 110, and the axial connection assembly 12 includes several reinforcing connection members 121, and the reinforcing connection member 121 is provided with a connecting portion 2 1211 respectively connecting the connecting portions 112 on both sides of the installation groove 110.

[0050] The sleeve 1 can be used to receive or launch a shield 5. It comprises several interconnected components 11, each arc-shaped, which, when connected, form an annular sleeve 1. Each component 11 of the sleeve 1 has a connecting portion 112, used to connect adjacent components 11, located on the outer wall of the circumferential end portion, spaced a certain distance from the end face. This creates a gap between adjacent components 11 when connected. This gap serves as a mounting groove 110 for installing an axial connection assembly 12. Once a section of the sleeve 1 is connected, several mounting grooves 110 parallel to the axial direction are formed. The axial connection assembly 12 is used to be installed in the installation groove 110, and it mainly includes a reinforcing connection member 121. The reinforcing connection member 121 can be set as needed, and its length is adapted to the length of the installation groove 110. It can also be provided with multiple reinforcing connection members 121, and the length of multiple reinforcing connection members 121 is equal to the length of the installation groove 110. The reinforcing connection member 121 in the installation groove 1 can be connected with the connecting part 112 of the components 11 on both sides through the connecting part 2 1211 thereon. After the connection, the connection part of each component 11 of the sleeve 1 can be made more firm and stronger, and can be better suitable for receiving or starting the shield 5 under a higher water pressure construction environment.

[0051] For the reinforced connection between the sleeves 1, several of the sleeves 1 are connected axially through an annular connecting assembly 13, and the outer wall of the end portion of the component 11 of the sleeve 1 connected to the adjacent sleeve 1 component 11 is provided with a connecting portion 3 111, and an installation groove 2 131 for installing the annular connecting assembly 13 is formed between the connecting portions 3 111 of two adjacent sleeve 1 components 11. The annular connecting assembly 13 includes a reinforced connecting member 2 132, and the reinforced connecting member 2 132 is provided with a connecting portion 4 1321 connecting the connecting portions 3 on both sides of the installing groove 2 131;.

[0052] The outer wall of the end portion of the component 11 of the sleeve 1 in the axial direction is further provided with a connection portion three 111. The connection portions three 111 of two adjacent sleeve 1 components 11 are spaced apart from each other, that is, they are retreated a certain distance in the axial direction. The space between them can be used as a mounting groove two 131. The annular connection component 13 can be installed in the mounting groove two 131. The annular connection component 13 can be used to strengthen the connection. The structure of the annular connection component 13 is basically the same as that of the axial connection component 12. The strengthening connection component two 132 of the annular connection component 13 is provided with a connection portion four 1321 connecting the connection portions three 111 on both sides of the mounting groove two 131.

[0053] By adopting the annular connection component 13, preferably adopting a structure basically the same as the axial connection component 12, it can achieve a better reinforcement effect between the sleeves 1 and form a reinforcement structure on the annular surface or the longitudinal plane, which cooperates more effectively with the lateral reinforcement structure.

[0054] In order to strengthen the connection between the components 11 and the sleeves 1 while also ensuring good sealing, the ends of two adjacent components 11 and the sleeves 1 are sealed. There are many ways to seal the connection, including traditional sealing connections, such as providing a sealing gasket, or welding sealing. By combining external reinforcement members with sealing, the connection strength and sealing between each component 11 of the sleeve 1 can be significantly improved, making it more suitable for the shield 5 construction environment with higher water pressure.

[0055] Through the above-mentioned technical solution, on the basis of the traditional sleeve 1, the flange connection part is moved back a certain distance, and an installation groove can be formed between the connection parts 112 of adjacent sleeve 1 components 11 and between sleeves 1 and sleeves 1. Each installation groove can be installed with a corresponding connection component respectively. Through the additional connection and sealing connection of the axial connection component and the annular connection component, effective sealing and pressure resistance can be achieved in the shield 5 construction environment with higher water pressure, thereby improving the structural strength of the connection between the components 11 and ensuring the safety of the shield 5 receiving or starting construction.

[0056] In one embodiment, please continue to refer to Figure 2-Figure 7As shown, the connection part 1 112, the connection part 2 1211, the connection part 3 111 and the connection part 4 are all flange structures.

[0057] In this way, by using flange structures as connection structures for connection part 1 112, connection part 2 1211, connection part 3 111 and connection part 4, a common connection method is retained. The only difference is that the flange structure is retreated a certain distance. This makes it easier to process connection part 1 112, connection part 2 1211, connection part 3 111 and connection part 4 when manufacturing the sleeve 1, without adding or more processing steps. It is more practical, convenient and the design is more reasonable.

[0058] In a preferred embodiment of the reinforcing connecting member 121 and the reinforcing connecting member 2 132, please refer to Figure 2 and Figure 3 As shown, the reinforcing connection member 121 and the reinforcing connection member 2 132 are both groove-type members, the side portions on both sides of the reinforcing connection member 121 are configured as the connection portion 2 1211, and the side portions on both sides of the reinforcing connection member 2 132 are configured as the connection portion 4 1321.

[0059] The trough-shaped reinforcement connecting member 121 and the reinforcement connecting member 2 132 are lightweight, making them easier to move and install. Furthermore, the trough-shaped structure allows the sidewalls to function as flanges, making them more convenient for connection to the connection portion 112 and the connection portion 3 111. In practice, the reinforcement connecting member 121 and the connection portion 112 are connected and fixed by bolts, while the reinforcement connecting member 2 132 and the connection portion 3 111 are also connected and fixed by bolts.

[0060] On this basis, combined with Figure 2 、 Figure 3 and Figure 7 As shown, in order to further improve the connection strength between the components 11 of the sleeve 1, the bottoms of the first and second reinforcing connection members 121 and 132 are each provided with a first connection hole 1212, and the end of the component 11 is provided with a second connection hole corresponding to the first connection hole 1212. The second connection hole and the first connection hole 1212 are connected by a fastener 14. By simultaneously connecting the bottoms of the first and second reinforcing connection members 121 and 132 to the component 11, the connection strength between the components 11 can be further improved.

[0061] In a specific implementation process, the second connection hole on the component 11 is a blind hole, which can avoid the problem of easy water leakage caused by using a through hole, and the fastener 14 can be connected by bolts.

[0062] Furthermore, the second installation groove 131 is connected to the first installation groove 110, and the first reinforcement connection member 121 of the annular connection assembly 13 and the second reinforcement connection member 132 of the axial connection assembly 12 are connected to each other to form an external reinforcement skeleton.

[0063] In this way, the connection between the installation groove 110 and the installation groove 2 131 can facilitate the connection between the axial connection component 12 and the annular connection component 13, so that they can be connected to form an integrated external reinforcement skeleton. Such an external reinforcement skeleton can better improve the connection stability between the components 11 and the sleeve 1, and can also improve the reliability of the sleeve 11 as a whole during the reception or launch process of the shield 5.

[0064] In order to better form an integrated skeleton structure, further, two adjacent reinforcing connecting members 121 and two adjacent reinforcing connecting members 2 132 are connected by fasteners. In this way, the strength of the external reinforcing skeleton can be improved to better resist high water pressure conditions.

[0065] Since the annular connection component 13 is used in the circumference of the sleeve and the axial connection component 12 is used in the axial or transverse direction of the sleeve 1, the bottoms of the reinforcing connection member 121 and the reinforcing connection member 2 132 are different in order to fit with the outer wall of the sleeve 1. Specifically, the bottom of the reinforcing connection member 121 is arc-shaped in the width direction, and the bottom of the reinforcing connection member 2 132 is arc-shaped in the length direction.

[0066] Combine Figure 6 and Figure 7 As shown, in some embodiments of the sealed connection, the components 11 are welded and sealed, or a sealing component 16 is provided on the outer wall of the component 11 to cover the gap between adjacent components 11 and is pressed by the axial connection component 12 or the annular connection component 13 to form a sealed connection.

[0067] The sealed connection can adopt different sealing methods according to the needs. For example, for a construction environment with high water pressure, welding sealing is adopted between the components 11, and a welding seal 15 is formed by welding. The stability and reliability of the sealing welding are better than the traditional sealing, so welding sealing is more suitable. Moreover, welding sealing can make the sleeve 1 form a whole and have overall sealing ability and stronger pressure resistance. For a construction environment with lower water pressure, a sealing component 1616 covering the gap between adjacent components 11 and being pressed by the axial connection component 12 or the annular connection component 13 can be provided on the outer wall of the component 11. The sealing component 16 can block the gap under the pressure of the axial connection component 12 or the annular connection component 13 to achieve a better sealing effect. Of course, the sealing structure is not limited to the above-mentioned sealing form, and other sealing structures can also be used.

[0068] During the specific implementation process, when welding sealing is adopted, the welding between the components 11 can be carried out on the inside of the sleeve in the bottom area of ​​the sleeve, which is convenient for welding operation. It is also convenient for cutting the weld after the construction is completed to separate and dismantle the sleeve 1. The welding of other places can be carried out on the outside.

[0069] In order to achieve enhanced connection and sealing between the end cover 19 and the sleeve 1, in an embodiment of the present application, the outer periphery of the end cover 19 is provided with a connecting portion 5 191 distributed along the circumferential direction, and the connecting portion 5 191 and the connecting portion 3 111 of the enclosed sleeve 1 are spaced apart to form an installation groove 3 for installing the annular connecting component 13, and the installation groove 3 is connected to the installation groove 1 110. The annular connecting component 13 is arranged in the installation groove 3 and the sleeve 1 is connected to the end cover 19 through the annular connecting component 13, and the end cover 19 and the sleeve 1 are sealed.

[0070] The end cap 19 is used to seal the end of the sleeve 1 away from the tunnel entrance after each section of the sleeve 1 is installed, so as to form a space inside that can be filled with sand or other media to receive the shield 5. Since the sleeve 1 is provided with a connection portion 3 111 for forming a mounting groove 3 at the axial upper end, in order to adapt the end cap 19 for installation, an adaptable connection portion 5 191 is also provided on the end cap 19. The connection portion 5 191 is also spaced a distance apart from the end face of the end cap 19 in the axial direction, so that when the end cap 19 is connected to the sleeve 1, a mounting groove 3 can be formed between the connection portion 3 111 on the sleeve 1, and the connection and fixation are performed through the annular connection assembly 18 in the mounting groove 3. Through such a technical solution, the end cap 19 and the sleeve 1 can better withstand the pressure in a construction environment with relatively high water pressure.

[0071] A sealed connection is also made between the end cap 19 and the sleeve 1 to improve the sealing performance of the connection. Figure 11 As shown, in order to facilitate the support of the end cover 19 during assembly, a second support connector 192 can be provided on the end cover 19, and the second support connector 192 can be connected to a second support leg 6 provided on the station ground through a flange.

[0072] To further enhance the overall rigidity of the sleeve 1, the third mounting groove is also connected to the first mounting groove 110, and the second reinforcing connecting member 132 in the third mounting groove is connected to the first reinforcing connecting member 121 in the first mounting groove 110. In this way, the axial connecting assembly 12 and the annular connecting assembly 18 are interconnected to form an external reinforcement framework, further enhancing the compressive strength and resistance of the sleeve 1 connection and the sleeve 1 itself.

[0073] In order to make the sleeve 1 have better pressure bearing capacity at parts other than the connection, such as Figure 1As shown, the outer wall of the component 11 is provided with a plurality of reinforcing ribs 120 distributed horizontally and vertically. The reinforcing ribs 120 distributed horizontally and vertically on the outer wall of the sleeve 1 can further improve the stability of the connection.

[0074] In the specific implementation process, combined with Figure 8 and Figure 9 As shown, the outer wall of the sleeve 1 is provided with lateral supports, with flange structures at the bottom ends of the lateral supports. To reduce the weight of the large-diameter sleeve 1, the bottom area of ​​the sleeve 1 was optimized, the radial dimension of the sleeve 1 base was shortened, and lateral supports with flanges were added on both sides of the sleeve 1. After the sleeve 1 was installed, the lateral supports were bolted to the flanged support leg 1-2, and the other end of the support leg 1-2 was fixed to the station floor. This greatly reduced the weight of the steel tower while meeting the rigidity requirements of the sleeve 1. It also facilitated assembly using external supports such as the support leg 1-2.

[0075] An embodiment of the present application further provides a shield machine 5 receiving method, based on any one of the above-mentioned shield machine 5 originating receiving systems, comprising the following steps:

[0076] Step S1: preliminarily assemble a sleeve 1 assembly of corresponding length according to the required length in the axial direction of the tunnel, and install the end cover 19 to seal the end of the sleeve 1 assembly.

[0077] In this step, the length of the sleeve 1 assembly needs to be configured according to demand. For example, if the actual length required is 12m, and each section is configured to be 2m long, 6 sections of sleeve 1 are required for connection and assembly.

[0078] Step S2: The assembled sleeve 1 component is connected and fixed to the embedded steel ring 4 of the station portal through the transition ring 3.

[0079] In this step, the assembled sleeve 1 assembly is connected to the embedded steel ring 4 through the transition ring 3, so as to form a channel that facilitates the entry and exit of the shield 5. In the implementation process, the transition ring 3 can also be set as a reinforced connection structure that adapts to the end of the sleeve 1, so that it can better receive or start.

[0080] Step S3: Setting an external support to connect the sleeve 1 assembly and the end cover 19 to form a rigid whole.

[0081] In this step, the sleeve 1 assembly needs to be supported by an external support and connected to the external support to form a whole, so that it can be more stable for initial reception or disassembly.

[0082] Step S4: Starting from one end of the sleeve 1 assembly close to the station portal, remove the reinforcing connection member 121 in the axial direction and the reinforcing connection member 2 132 in the circumferential direction in turn, and then perform sealing connections between two adjacent components 11 on the sleeve 1 and between two adjacent sleeves 1. After the sealing connections are performed, reinstall the reinforcing connection member 121 and the reinforcing connection member 2 132; the sealing connection selects different sealing connection methods according to different water pressures. Under the first water pressure condition, welding sealing is adopted. Under the second water pressure condition lower than the first water pressure, the rubber pad is pressed under the reinforcing connection member 121 or the reinforcing connection member 2 132 to seal the gap between the components 11.

[0083] In this step, welding sealing or gasket sealing can be selected according to different water pressure conditions. In this way, both sealing methods can play an effective sealing role under the corresponding water pressure conditions.

[0084] Step S5: In the bottom area of ​​the sleeve 1 assembly, the components 11 and the sleeve 1 are connected by a sealing method of welding from the inside.

[0085] In this step, the bottom area of ​​the sleeve 1 assembly is welded on the inside of the sleeve 1, and the remaining connection parts are welded on the outside. It is more convenient to weld the bottom area on the inside. If it is welded on the outside, a large working space needs to be reserved for the bottom area, which will increase a lot of costs.

[0086] Step S6: Perform a water pressure test on the assembled sleeve 1, and repair the parts that do not meet the pressure requirements until the pressure requirements are met.

[0087] In this step, the sealing and strength can be tested by applying water pressure test.

[0088] Step S7: Backfill the excavation medium into the sleeve 1 to prepare for the shield 5 to receive it.

[0089] In this step, the backfill in the sleeve 1, such as sand, which can be used as an excavation medium for the shield 5 to excavate, can maintain the water and soil balance inside and outside. In addition to sand as an excavation medium, it can also be mortar, foam concrete, or shield slag. After the shield passes through the station structure wall and completely enters the steel sleeve, and the shield tail leaves the tunnel portal, mortar slurry can be injected into the gap between the pipe segment and the embedded steel ring through the pipe segment grouting hole. After the slurry is completely solidified, the channel for mud and water outside the station to enter the station is blocked. At this time, the steel sleeve support, steel sleeve, and shield can be removed. At this point, the shield reception is completed.

[0090] It should be noted that during the preliminary assembly process before welding for sealing under high water pressure conditions, each sleeve section 1 can be installed with axial connection components 12 at both ends or in the middle, and the remaining connection parts do not need to be installed. This can reduce the workload of disassembly before welding, and also facilitate the preliminary fixing function during the assembly process. Similarly, the annular connection component 13 can also be installed partially for preliminary fixation.

[0091] The embodiments of this application only illustrate the receiving case. In other implementation scenarios, it can also be combined with the company's sleeve starting patent technology ZL202320780143.3, a spring steel plate brush pressure adjustable sleeve assembly and shield starting system, ZL20222 23916099, a shield starting steel sleeve and shield starting device, which can also be fully applied to the starting of the shield, and can meet the shield starting requirements of projects with high water pressure and deep burial depth.

[0092] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A shield machine launching and receiving system, characterized in that: comprising a sleeve assembly and an end cap, wherein the end cap closes one end of the sleeve assembly; The sleeve assembly includes several sections of sleeves for receiving or launching shield machines and an axial connection assembly connecting two adjacent components. The sleeve includes several components for connecting to each other to form the sleeve. The components are arc-shaped. The components are provided with a connecting portion 1 on the outer wall of the end portion connected to the adjacent components. The connecting portions 1 of the two adjacent components are spaced to form a mounting groove 1. The axial connection assembly is arranged in the mounting groove 1. The axial connection assembly includes several reinforcing connection members 1. The reinforcing connection member 1 is provided with a connecting portion 2 connecting the connecting portions 1 on both sides of the mounting groove 1. Several sections of the sleeve are connected axially by an annular connecting assembly. The sleeve components are provided with a connecting portion 3 on the outer wall of the end portion connected to the adjacent sleeve components. An installation groove 2 for installing the annular connecting assembly is formed between the connecting portions 3 of two adjacent sleeve components. The annular connecting assembly includes a reinforcing connecting member 2, and the reinforcing connecting member 2 is provided with a connecting portion 4 connecting the connecting portions 3 on both sides of the installation groove 2. The ends of two adjacent components and the sleeves are sealed and connected.

2. A shield launching and receiving system as claimed in claim 1, characterized in that: The connection part 1, the connection part 2, the connection part 3 and the connection part 4 are all flange structures.

3. A shield launching and receiving system as claimed in claim 1, characterized in that: The reinforcing connection member 1 and the reinforcing connection member 2 are both groove-shaped members, the side portions on both sides of the reinforcing connection member 1 are configured as the connection portion 2, and the side portions on both sides of the reinforcing connection member 2 are configured as the connection portion 4.

4. A shield launching and receiving system as claimed in claim 3, characterized in that: The bottoms of the first and second reinforcing connecting members are both provided with a first connecting hole, and the ends of the components are provided with a second connecting hole corresponding to the first connecting hole, and the second connecting hole is connected to the first connecting hole via a fastener; And / or, two adjacent reinforcing connection members 1 and two adjacent reinforcing connection members 2 are connected by fasteners.

5. A shield launching and receiving system as claimed in claim 1, characterized in that: The second installation groove is communicated with the first installation groove, and the first reinforcement connecting member is connected with the second reinforcement connecting member to form an external reinforcement skeleton.

6. A shield launching and receiving system as claimed in claim 1, characterized in that: The components are welded and sealed, or sealing components covering the gaps between adjacent components and pressed by the axial connection assembly or the annular connection assembly are provided on the outer walls of the components to form a sealed connection.

7. A shield launching and receiving system as claimed in claim 1, characterized in that: The outer periphery of the end cover is provided with a connecting portion five distributed along the circumferential direction, and the connecting portion five and the connecting portion three of the closed sleeve are spaced apart to form an installation groove three for installing an annular connecting component. The installation groove three is communicated with the installation groove one, and the annular connecting component is arranged in the installation groove and the sleeve and the end cover are connected through the annular connecting component, and the end cover and the sleeve are sealed.

8. A shield launching and receiving system as claimed in claim 7, characterized in that: The third installation groove is communicated with the first installation groove, and the second reinforcing connecting member in the third installation groove is connected with the first reinforcing connecting member in the first installation groove.

9. A shield launching and receiving system as claimed in claim 1, characterized in that: The outer wall of the component is provided with a plurality of reinforcing ribs distributed horizontally and vertically, or the outer wall of the sleeve is provided with a lateral support member, and the bottom end of the lateral support member is provided with a flange structure.

10. A shield receiving method, based on a shield starting receiving system according to any one of 1 to 9 above, characterized in that: The following steps are involved: Preliminarily assemble a sleeve assembly of corresponding length according to the required length in the tunnel axial direction, and install the end cap to seal the end of the sleeve assembly; Connect and fix the assembled sleeve assembly to the embedded steel ring of the station portal through the transition ring; An external support is provided to connect the sleeve assembly and the end cover to form a rigid whole; Starting from one end of the sleeve assembly near the station portal, the axially extending reinforcing connection member 1 and the circumferentially extending reinforcing connection member 2 are removed in sequence, and then a sealing connection is made between two adjacent components on the sleeve and between two adjacent sleeves. After the sealing connection is made, the reinforcing connection member 1 and the reinforcing connection member 2 are reinstalled; the sealing connection is performed in different ways depending on the water pressure. Under a first water pressure condition, welding sealing is used. Under a second water pressure condition lower than the first water pressure, a rubber pad is pressed under the reinforcing connection member 1 or the reinforcing connection member 2 to seal the gap between the components; In the bottom area of ​​the sleeve assembly, the components and the sleeve are connected by a sealing method of welding from the inside; Carry out water pressure test on the assembled sleeve and repair the parts that do not meet the pressure requirements until they meet the pressure requirements; Backfill the excavation medium into the sleeve and prepare for the shield to receive it.

Images