Mechanical receiving method for shield tunnel construction

Abstract

The present invention belongs to the technical field of tunnel construction, and specifically relates to a mechanical receiving method for a shield-bored tunnel. The mechanical receiving method for a shield-bored tunnel comprises the following steps: Step S101, providing a pre-buried steel shell on the end wall of a station that receives a shield machine; Step S201, coaxially installing a removable steel shell on the pre-buried steel shell, and installing an annular pressurized sealing device on the inner wall of the pre-buried steel shell and the inner wall of the removable steel shell; Step S301, causing the end plate to seal the opening of the removable steel shell, with the station end wall, the removable steel shell, and the end plate forming a cylindrical cavity; Step S401, ensuring pressure balance on the tunnel face when receiving the shield machine; Step S501, after the cutterhead of the shield machine passes through the annular pressurized sealing device, pressurizing the annular pressurized sealing device with a pressurized oil pump, so that the annular pressurized sealing device forms a dynamic seal with the shield machine casing.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a mechanical receiving method for a tunnel constructed using a shield method. Background Art

[0002] In urban subway construction, site or ground conditions often limit the implementation of end reinforcement, or the end reinforcement effect does not meet the requirements for shield acceptance. Therefore, how to safely, practically, and economically accept the shield is a topic of great concern in the shield engineering community.

[0003] In traditional construction methods, the soil at the end is often reinforced before the shield is received. The purpose of reinforcement is twofold: first, to improve the strength and stability of the soil behind the portal retaining wall to prevent soil instability after the shield breaks through the wall, causing ground deformation, ground subsidence, and even collapse; second, the reinforced soil can form an effective water-stop curtain within a certain range of the tunnel entrance, preventing groundwater from seeping into the working shaft through the tunnel entrance after the tunnel entrance is opened. This is especially true in sandy soil layers with high groundwater levels and high permeability. If there is a large loss of groundwater in the soil layer, it can also cause ground subsidence.

[0004] Currently, the main methods of shield tunneling end reinforcement include grouting, jet grouting, pile mixing, and freezing. However, in actual projects, the ground structure is often complex, and the various reinforcement techniques and reinforcement body inspection methods currently have certain limitations. The effectiveness of end reinforcement cannot be fully guaranteed, and the risks of shield tunneling cannot be fully controlled.

[0005] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0006] The object of the present invention is to provide a mechanical receiving method for shield tunnel construction to solve or alleviate the problems existing in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The mechanical receiving method for a shield tunnel construction includes the following steps:

[0009] Step S101, setting a pre-buried steel shell on the end wall of the station receiving the shield machine;

[0010] Step S201: coaxially installing a detachable steel shell on the embedded steel shell, and installing an annular pressurized sealing device on the inner wall of the embedded steel shell and the inner wall of the detachable steel shell;

[0011] Step S301: fixing the end plate to the end of the removable steel shell away from the embedded steel shell, so that the end plate blocks the opening of the removable steel shell, and the station end wall, the removable steel shell and the end plate form a cylindrical cavity;

[0012] Step S401: A grouting pump injects grout through the grouting holes provided on the end plate to fill the cylindrical cavity and maintain pressure to ensure pressure balance on the tunnel face when the shield machine receives the cavity.

[0013] Step S501: After the cutterhead of the shield machine passes through the annular pressurized sealing device, pressurizing the annular pressurized sealing device through a pressurized oil pump, so that the annular pressurized sealing device forms a dynamic seal with the shield machine housing;

[0014] Step S601: remove the end plate and drain the slurry in the cylindrical cavity.

[0015] Furthermore, after step S601, the following steps are also included: Step S701, after the shield machine passes through the tunnel portal, the annular pressurized sealing device is further pressurized by the pressurized oil pump to form a static seal between the annular pressurized sealing device and the tunnel segment.

[0016] Furthermore, after step S701, the following steps are further included:

[0017] S801, a second annular cavity is formed between the annular pressurized sealing device on the embedded steel shell, the tunnel segments, the embedded steel shell and the retaining structure, and a grouting pump grouts and fills the second annular cavity through the embedded grouting pipe.

[0018] Furthermore, after step S801, the following steps are also included:

[0019] S901, controlling the annular pressurized sealing device on the detachable steel shell to release pressure by a pressurized oil pump, and removing the detachable steel shell and the annular pressurized sealing device on the detachable steel shell;

[0020] S1001: An annular sealing plate is fixed to the end face of the station end wall and / or the end face of the embedded steel shell. The annular sealing plate is in sealing engagement with the outer circumferential surface or end face of the tunnel segment. The tunnel segment, the embedded steel shell, the annular pressurized sealing device on the embedded steel shell, and the annular sealing plate form a first annular cavity.

[0021] S1101, controlling the pressure relief of the annular pressurized sealing device on the embedded steel shell by a pressurized oil pump;

[0022] S1201, a grouting pump fills the first annular cavity with grouting through the pre-buried grouting holes provided on the sealing plate.

[0023] Furthermore, the annular pressurized sealing device includes an annular pressurized expansion bag; in the step S501 and the step S701, the pressurized oil pump is connected to the input end of the annular pressurized expansion bag through the hydraulic oil pipe, and the pressure oil is transmitted to the annular pressurized expansion bag along the hydraulic oil pipe, so that the annular pressurized expansion bag expands to apply pressure to the tail brush, pressing the tail brush tightly against the shield machine casing or tunnel segment, thereby realizing the sealing function of the pressurized sealing device.

[0024] Furthermore, the pressurized sealing device further comprises an annular connecting plate and a plurality of support plates, wherein the outer ring of the annular connecting plate is fixed to the inner wall of the corresponding sleeve; the plurality of support plates are hinged to the annular connecting plate, and the hinge axis is parallel to the radial direction of the sleeve;

[0025] In the step S201 , the annular pressurized expansion bladder is disposed between the support plate and the corresponding sleeve, and the support plate is used to support the annular pressurized expansion bladder.

[0026] Furthermore, the pressurized sealing device further comprises an annular rubber cover, the annular rubber cover comprising a first portion and a second portion, the first portion being disposed between the annular pressurized expansion bag and the support plate, and the second portion extending out of the support plate;

[0027] In the step S501 and the step S701, the second portion is used to press against the corresponding tail brush after the annular pressurized expansion bladder is expanded.

[0028] Furthermore, the second portion is an enlarged portion. In the step S501 and the step S701, the enlarged portion is used to increase the contact area with the corresponding tail brush.

[0029] Beneficial effects: The mechanical receiving method for shield tunnel construction of the present invention ensures the sealing and safety during the shield receiving process without end reinforcement and is applicable to various geological conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0031] Figure 1 A structural diagram of an annular pressurized sealing device in a mechanical receiving method for a shield tunnel construction method according to an embodiment of the present invention;

[0032] Figure 2 A construction drawing of step S401 of the mechanical receiving method for shield tunnel construction provided by an embodiment of the present invention;

[0033] Figure 3 A construction drawing of step S501 of the mechanical receiving method for shield tunnel construction provided by an embodiment of the present invention;

[0034] Figure 4 A construction drawing of step S701 of the mechanical receiving method for shield tunnel construction provided by an embodiment of the present invention;

[0035] Figure 5 This is a construction drawing of step S1001 of the mechanical receiving method for shield tunnel construction provided by an embodiment of the present invention.

[0036] In the figure: 1. End plate, 2. Annular connecting plate, 3. Support plate, 4. Tail brush, 5. Removable steel shell, 6. Embedded grouting pipe, 7. Embedded steel shell, 8. Station end wall, 9. Vertical part, 10. First part, 11. Expansion part, 12. Annular pressurized expansion bag, 13. Shield machine casing, 14. Tunnel segment, 15. Annular sealing plate. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0038] The present invention will be described in detail below with reference to the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.

[0039] In view of the problems in current actual shield tunnel construction projects, such as the inability to fully guarantee the effectiveness of end reinforcement and the existence of safety risks during reception, the present invention proposes a mechanical reception method for shield tunnel construction. The mechanical reception method for shield tunnel construction is achieved by a receiving end mechanical device for shield tunnel construction. The adopted receiving end mechanical device for shield tunnel construction is now described as follows:

[0040] The receiving end mechanical device of the shield tunnel construction method includes a sleeve, an end plate 1, a grouting pump, an annular pressure sealing device, an annular sealing plate 15, and a pressure oil pump.

[0041] The sleeve includes a pre-embedded steel shell 7 and a removable steel shell 5. In a preferred embodiment of the present invention, the axial length of the pre-embedded steel shell 7 is 900 mm, and the axial length of the removable steel shell 5 is 1500 mm. The pre-embedded steel shell 7 is pre-embedded in the station end wall 8, and the removable steel shell 5 is coaxially fixed to the pre-embedded steel shell 7. The radial dimension of the inner wall of the removable steel shell 5 is the same as the radial dimension of the inner wall of the pre-embedded steel shell 7. The distance between the inner wall of the removable steel shell 5 and the shield machine housing 13 is 150 mm, and the distance between the inner wall of the removable steel shell 5 and the tunnel segment 14 is 250 mm (that is, the distance between the inner wall of the pre-embedded steel shell 7 and the shield machine housing 13 is 150 mm, and the distance between the inner wall of the pre-embedded steel shell 7 and the tunnel segment 14 is 250 mm). The outer walls of the pre-embedded steel shell 7 and the removable steel shell 5 are both pre-installed with connectors, which are ear plates with holes. The connectors of the pre-embedded steel shell 7 and the connectors on the removable steel shell 5 are connected by bolts. An enclosure structure is provided at one end of the station end wall 8 away from the embedded steel shell 7 .

[0042] The end plate 1 is fixed to the end of the removable steel shell 5 away from the embedded steel shell 7. The end plate 1 blocks the opening of the removable steel shell 5. The station end wall 8, the removable steel shell 5, and the end plate 1 form a cylindrical cavity. Grouting holes are provided in the end plate 1. The grouting pump injects grout through the grouting holes to fill the cylindrical cavity and maintain pressure.

[0043] The embedded steel shell 7 and the removable steel shell 5 are both provided with an annular pressurized sealing device, such as Figure 1 As shown, the annular pressurized sealing device includes an annular pressurized expansion bladder 12, an annular connecting plate 2, a support plate 3, an annular rubber cover, and a tail brush 4. When the shield machine passes, the annular pressurized sealing device forms a dynamic seal between the embedded steel shell 7 and the shield machine housing 13 through the tail brush 4. After the shield machine passes, the annular pressurized sealing device forms a static seal between the embedded steel shell 7 and the tunnel segment 14 through the tail brush 4. Specifically, the pressurized oil pump is connected to the input end of the annular pressurized expansion bladder 12 through a hydraulic oil pipe. The pressurized oil is transmitted to the annular pressurized expansion bladder 12 along the hydraulic oil pipe, causing the annular pressurized expansion bladder 12 to expand and apply pressure to the tail brush 4, pressing the tail brush 4 against the shield machine housing 13 or the tunnel segment 14, thus realizing the sealing function of the pressurized sealing device.

[0044] The outer ring of the annular connecting plate 2 is fixed to the inner wall of the corresponding sleeve. In the preferred embodiment of the present invention, the radial width of the annular connecting plate 2 is 60 mm. Multiple support plates 3 are arranged in a circular ring and hinged to the annular connecting plate 2, with the hinge axis parallel to the radial direction of the sleeve. The annular pressurized expansion bladder 12 is disposed between the support plate 3 and the corresponding sleeve. The main function of the support plate 3 is to support the annular pressurized expansion bladder 12 when it is not expanded, maintain the general shape of the annular pressurized expansion bladder 12, and prevent the annular pressurized expansion bladder 12 from interfering with the construction.

[0045] The cross section of the annular rubber cover is L-shaped, including a vertical portion 9 and a horizontal portion. The vertical portion 9 is arranged between the annular connecting plate 2 and the annular pressurized expansion bladder 12. The function of the vertical portion is to prevent the annular rubber cover from slipping off the support plate 3. The horizontal portion has a first part 10 and a second part. The first part 10 is arranged between the annular pressurized expansion bladder 12 and the support plate 3. The second part is an enlarged portion 11 and extends out of the support plate 3. The enlarged portion 11 is used to press against the tail brush 4 after the annular pressurized expansion bladder 12 is expanded. The annular pressurized expansion bladder 12 is pressed against the tail brush 4 through the annular rubber cover. The main function of the annular rubber cover is to prevent the annular pressurized expansion bladder 12 from contacting the hard tail brush 4 and to prevent the annular pressurized expansion bladder 12 from being punctured and leaking by the tail brush 4. The enlarged portion 11 is used to increase the contact area with the tail brush 4, which is beneficial to ensure the sealing effect.

[0046] Working principle of the annular pressurized sealing device: The passage of the shield machine will cause the tail brush 4 to bend, and the bent part of the tail brush 4 will come into contact with the shield machine casing 13. At this time, there is also a sealing relationship between the tail brush 4 and the shield machine casing 13, but this sealing relationship mainly relies on the elastic force of the tail brush 4 and is not reliable. Pressurized oil is injected into the annular pressurized expansion bag 12 of the annular pressurized sealing device through a pressurized oil pump. The annular pressurized expansion bag 12 expands, pressing the enlarged part 11 against the tail brush 4, and the tail brush 4 is pressed against the shield machine casing 13 or the tunnel segment 14 to achieve a reliable dynamic seal between the annular pressurized sealing device and the tail brush 4. After the shield machine passes, the tail brush 4 forms a reliable static seal between the embedded steel shell 7 and the tunnel segment 14 under the pressure of the annular pressurized expansion bag 12.

[0047] The annular pressurized sealing device of the present invention can adjust its pressure according to actual needs, facilitating adjustment of the sealing state between it and the shield machine casing 13 or tunnel segment 14, thereby ensuring a good sealing effect. By adjusting the pressure of the annular pressurized sealing device, the gap between the shield machine and the removable steel shell 5 and / or embedded steel shell 7 is sealed, effectively ensuring the sealing and water-stopping effects, avoiding the occurrence of water seepage, ground subsidence, etc., and ensuring the effectiveness of the end reinforcement and the safety of the shield construction acceptance.

[0048] After the removable steel shell 5 is removed from the embedded steel shell 7, the radially outer side of the annular sealing plate 15 is connected to the embedded steel shell 7, and the radially inner side is connected to the surface of the tunnel segment 14. The tunnel segment 14, the embedded steel shell 7, the annular pressurized seal on the embedded steel shell 7, and the annular sealing plate 15 form a first annular cavity. The annular sealing plate 15 is provided with a through hole for grouting. A grouting pump injects grout through the through hole to fill the first annular cavity, thereby achieving a long-term and reliable seal between the tunnel segment 14 and the embedded steel shell 7.

[0049] A second annular cavity is formed between the annular pressurized sealing device on the embedded steel shell 7, the tunnel segments 14, the embedded steel shell 7 and the enclosure structure. The receiving end mechanical device of the shield tunnel construction also includes a embedded grouting pipe 6, which connects the second annular cavity with the outside world. The grouting pump injects grout into the second annular cavity through the embedded grouting pipe 6 to achieve a long-term and reliable seal between the embedded steel shell 7 and the tunnel segments 14. Preferably, the pipe wall of the embedded grouting pipe 6 is provided with a one-way grouting hole (not shown in the figure), and there are 6 one-way grouting holes and they are all located between the enclosure structure and the annular pressurized sealing device on the embedded grouting pipe 6.

[0050] The mechanical receiving method for a shield tunnel constructed by the present invention comprises the following steps: The mechanical receiving method for a shield tunnel constructed by the shield method is implemented by using the above-mentioned receiving end mechanical device for a shield tunnel constructed by the shield method, and comprises the following steps:

[0051] Step S101, setting a pre-buried steel shell 7 on the end wall 8 of the station receiving the shield machine;

[0052] Step S201: coaxially install the removable steel shell 5 on the embedded steel shell 7, and install an annular pressurized sealing device on the inner wall of the embedded steel shell 7 and the inner wall of the removable steel shell 5;

[0053] Step S301: fix the end plate 1 to the end of the removable steel shell 5 away from the embedded steel shell 7, so that the end plate 1 blocks the opening of the removable steel shell 5. The station end wall 8, the removable steel shell 5 and the end plate 1 form a cylindrical cavity.

[0054] Step S401, as Figure 2 As shown, the grouting pump injects grout through the grouting holes provided on the end plate 1 to fill the cylindrical cavity and maintain pressure to ensure pressure balance on the tunnel face when the shield machine receives it;

[0055] Step S501, as Figure 3 As shown, after the cutter head of the shield machine passes through the annular pressurized sealing device, the annular pressurized sealing device is pressurized by the pressurized oil pump, so that the annular pressurized sealing device forms a dynamic seal with the shield machine housing 13;

[0056] Step S601: remove the end plate 1 and drain the slurry in the cylindrical cavity;

[0057] Step S701, as Figure 4 As shown, after the shield machine passes through the tunnel portal, the annular pressurized sealing device is further pressurized by the pressurized oil pump, so that the annular pressurized sealing device and the tunnel segment 14 form a static seal.

[0058] S801, a second annular cavity is formed between the annular pressurized sealing device on the embedded steel shell 7, the tunnel segments 14, the embedded steel shell 7 and the surrounding structure, and the grouting pump grouts and fills the second annular cavity through the embedded grouting pipe 6.

[0059] S901, controlling the annular pressurized sealing device on the detachable steel shell 5 to release pressure by means of a pressurized oil pump, and removing the detachable steel shell 5 and the annular pressurized sealing device on the detachable steel shell 5;

[0060] S1001, such as Figure 5 As shown, an annular sealing plate 15 is fixed to the end face of the station end wall 8 and / or the end face of the embedded steel shell 7. The annular sealing plate 15 is in sealing cooperation with the outer peripheral surface or end face of the tunnel segment 14. The tunnel segment 14, the embedded steel shell 7, the annular pressurized sealing device on the embedded steel shell 7, and the annular sealing plate 15 form a first annular cavity.

[0061] S1101, controlling the pressure relief of the annular pressurized sealing device on the embedded steel shell 7 by the pressurized oil pump;

[0062] S1201, a grouting pump fills the first annular cavity with grouting through the pre-buried grouting holes provided on the sealing plate.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A mechanical receiving method for a shield tunnel, characterized in that: The steps include: Step S101, setting a pre-buried steel shell on the end wall of the station receiving the shield machine; Step S201: coaxially installing a detachable steel shell on the embedded steel shell, and installing an annular pressurized sealing device on the inner wall of the embedded steel shell and the inner wall of the detachable steel shell; Step S301: fixing an end plate to an end of the removable steel shell away from the embedded steel shell, so that the end plate blocks the opening of the removable steel shell, and the station end wall, the removable steel shell and the end plate form a cylindrical cavity; Step S401: A grouting pump injects grout through the grouting holes provided on the end plate to fill the cylindrical cavity and maintain pressure to ensure pressure balance on the tunnel face when the shield machine receives the cavity. Step S501: After the cutterhead of the shield machine passes through the annular pressurized sealing device, pressurizing the annular pressurized sealing device through a pressurized oil pump, so that the annular pressurized sealing device forms a dynamic seal with the shield machine housing; Step S601: remove the end plate and drain the slurry in the cylindrical cavity; Step S701: After the shield machine passes through the tunnel portal, the annular pressurized sealing device is further pressurized by the pressurized oil pump to form a static seal between the annular pressurized sealing device and the tunnel segment. The annular pressurized sealing device includes an annular pressurized expansion bag, a plurality of support plates and an annular rubber cover; The support plate is used to support the annular pressurized expansion bag; The annular rubber cover comprises a first portion and a second portion, wherein the first portion is disposed between the annular pressurized expansion bladder and the support plate, and the second portion extends out of the support plate; In the step S501 and the step S701, the second portion is used to press on the corresponding tail brush after the annular pressurized expansion bladder is expanded, and the tail brush is pressed on the shield machine casing or the tunnel segment; The second portion is an enlarged portion. In step S501 and step S701, the enlarged portion is used to increase the contact area with the corresponding tail brush.

2. The mechanical receiving method for shield tunnel construction according to claim 1, characterized in that: After step S701, the following steps are also included: S801, a second annular cavity is formed between the annular pressurized sealing device on the embedded steel shell, the tunnel segments, the embedded steel shell and the retaining structure, and a grouting pump grouts and fills the second annular cavity through the embedded grouting pipe.

3. The mechanical receiving method for shield tunnel construction according to claim 2, characterized in that: After step S801, the following steps are also included: S901, controlling the annular pressurized sealing device on the detachable steel shell to release pressure by a pressurized oil pump, and removing the detachable steel shell and the annular pressurized sealing device on the detachable steel shell; S1001: An annular sealing plate is fixed to the end face of the station end wall and / or the end face of the embedded steel shell. The annular sealing plate is in sealing engagement with the outer circumferential surface or end face of the tunnel segment. The tunnel segment, the embedded steel shell, the annular pressurized sealing device on the embedded steel shell, and the annular sealing plate form a first annular cavity. S1101, controlling the pressure relief of the annular pressurized sealing device on the embedded steel shell by a pressurized oil pump; S1201, a grouting pump fills the first annular cavity with grouting through the pre-buried grouting holes provided on the sealing plate.

4. The mechanical receiving method for shield tunnel construction according to claim 1, characterized in that: In step S501 and step S701, the pressurized oil pump is connected to the input end of the annular pressurized expansion bag through a hydraulic oil pipe, and the pressurized oil is transmitted to the annular pressurized expansion bag along the hydraulic oil pipe, causing the annular pressurized expansion bag to expand to apply pressure to the tail brush, pressing the tail brush tightly against the shield machine casing or tunnel segment, thereby realizing the sealing function of the pressurized sealing device.

5. The mechanical receiving method for shield tunnel construction according to claim 4, characterized in that: The pressurized sealing device further comprises an annular connecting plate, the outer ring of which is fixed to the inner wall of the corresponding sleeve comprising the embedded steel shell and the detachable steel shell; the plurality of support plates are hinged to the annular connecting plate, with the hinge axis being parallel to the radial direction of the sleeve; In the step S201 , the annular pressurized expansion bag is disposed between the support plate and the corresponding sleeve.

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