Construction method for shield tunneling machine to start in subsurface tunnel without dismantling negative ring

Abstract

The invention discloses a construction method for a shield tunneling machine to start a subsurface tunnel without dismantling a negative ring and a heating device. The construction method comprises the following steps that a subway station is obtained through construction, the subsurface tunnel is obtained through excavation in the subway station, and a shield tunnel portal is obtained through construction on the tunnel face of the subsurface tunnel; arranging a shield body on the shield tunnel portal; constructing a ring beam at a shield tunnel portal, and constructing a reinforced concrete counter-force device at the tail part of a shield body in the subsurface tunnel; arranging a shield tunneling machine trolley in the subsurface tunnel, and connecting the shield tunneling machine trolley with a shield body to obtain a shield tunneling machine; starting a shield tunneling machine to obtain a shield tunnel; and the bracket is dismantled, and the shield tunnel is connected with the subsurface tunnel through a binding agent. The problem that in the existing construction process, a reaction frame and a negative ring duct piece need to be dismantled can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunneling, and in particular to a construction method for a shield machine without removing a negative ring at the start of a dark tunnel excavation. Background Art

[0002] During the construction of urban subways, due to the influence of the strata (such as high gas content) and the surrounding environment (such as passing under the existing subway operating line), it is often necessary to set up a section of dark tunnel inside the shield tunnel. The purpose of this is to ensure the construction safety of the buildings above the subway and prevent the risk of gas accumulation in high-gas tunnels.

[0003] Conventional shield machines usually need to construct guide platforms, install reaction frames, assemble negative rings, and other processes when starting construction of dark tunnels. After the start, the negative ring segments will be removed, and eventually the portal will be constructed to close the tunnel. However, when removing the reaction frames and negative ring segments, the operating space is very limited due to the small cross-section of the tunnel, and the safety risks are high, the demolition time is long, and the labor input is high. In addition, after the tunnel is through, the portal ring beam still needs to be constructed, which further extends the construction period and affects the progress of the tunnel handover.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method for a shield machine without removing the negative ring at the start of a dark tunnel, thereby solving the problem that the reaction frame and the negative ring segments need to be removed during the existing construction process.

[0006] The present invention is achieved through the following technical solutions: A construction method for a shield machine without removing a negative ring at the start of a dark tunnel excavation, comprising the following steps: A subway station is constructed, a dark-cut tunnel is excavated at the subway station, and a shield tunnel portal is constructed at the heading face of the dark-cut tunnel; A shield body is provided at the shield tunnel portal; A ring beam is constructed at the shield tunnel portal, and a reinforced concrete reaction device is constructed at the tail of the shield body in the dark excavated tunnel; A shield machine trolley is arranged in the dark excavation tunnel and connected to the shield body to obtain a shield machine; Starting the shield machine to obtain a shield tunnel; The bracket is removed, and the shield tunnel is connected to the dark-excavated tunnel by an adhesive.

[0007] Optionally, the step of providing a shield body at the shield tunnel portal comprises the following steps: A guide platform is constructed at one end of the dark excavated tunnel near the shield tunnel portal; A bracket is provided on the guiding platform, and the shield body is arranged at the shield portal through the bracket.

[0008] Optionally, the step of providing the bracket on the guiding platform includes the following steps: Lift the bracket at the hoisting shaft of the subway station; Translate the bracket from the subway station to the mined tunnel; Connect the bracket to the guiding platform.

[0009] Optionally, the step of arranging the shield body at the shield portal through the bracket includes the following steps: Lift and place the shield body on the bottom plate of the subway station; Transfer and place the shield body from the subway station to the bracket; Translate the shield body to the guiding platform through the bracket; Push the shield body on the guiding platform to the shield portal.

[0010] Optionally, the step of providing the shield machine trolley in the mined tunnel includes the following steps: Lift and place the components of the shield machine trolley at the hoisting shaft on the bottom plate of the subway station, and then assemble to obtain the shield machine trolley; Transfer and place the shield machine trolley from the subway station to the bracket; Translate the shield machine trolley to the location of the shield body through the bracket.

[0011] Optionally, the step of starting the shield machine includes the following steps: Drive the shield machine for tunneling; Stop tunneling after the shield tail of the shield machine crosses the shield portal.

[0012] Optionally, it further includes the following steps: During the process of starting the shield machine, install the negative ring segments in the mined tunnel.

[0013] Optionally, fill the binder between the negative ring segments and the secondary lining of the mined tunnel.

[0014] Optionally, the binder is a mixture of pea gravel and mortar.

[0015] Optionally, the strength of the binder is 2.5 - 5.0 MPa.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: A construction method for a shield machine starting in a mined tunnel without removing the negative ring provided by the present invention. By setting a shield machine at the face of the mined tunnel, on this basis, a ring beam is constructed at the shield portal, and a reinforced concrete reaction device is constructed at the tail of the shield body in the mined tunnel to replace the conventional reaction frame made of steel sections, thereby fundamentally avoiding the situation of removing the negative ring and the reaction frame, so as to solve the problems of small site in the mined tunnel, difficult operation in removing the steel structure reaction frame and negative ring, and high safety risk coefficient; by using an adhesive to connect the shield tunnel and the mined tunnel into one body, and effectively strengthening the structure on the basis of not removing the negative ring and the reaction frame, so as to avoid the problem of segment displacement caused by vibration during the later subway operation; this method can complete the construction of the shield portal in advance, ensuring the handover time of the tunnel. Not removing the negative ring and the reaction frame effectively improves the safety factor and operability of the construction, and at the same time saves labor and mechanical costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0018] In the drawings: Figure 1 is a flow chart of the construction method for a shield machine starting in a mined tunnel without removing the negative ring provided by the embodiment of the present invention; Figure 2 is a plan view of the guide table construction provided by the embodiment of the present invention; Figure 3 is a longitudinal sectional view of the guide table construction provided by the embodiment of the present invention; Figure 4 is a transverse sectional view of the guide table construction provided by the embodiment of the present invention; Figure 5 is a plan view of the bracket construction provided by the embodiment of the present invention; Figure 6 is a longitudinal sectional view of the bracket construction provided by the embodiment of the present invention; Figure 7 is a transverse sectional view of the bracket construction provided by the embodiment of the present invention; Figure 8 is a plan view of the shield body hoisting provided by the embodiment of the present invention; Figure 9 is a longitudinal sectional view of the shield body hoisting provided by the embodiment of the present invention; Figure 10 is a transverse sectional view of the shield body hoisting provided by the embodiment of the present invention; Figure 11The plan view of the shield body provided by the embodiment of the present invention; Figure 12 The longitudinal sectional view of the shield body provided by the embodiment of the present invention; Figure 13 The cross-sectional view of the shield body provided by the embodiment of the present invention; Figure 14 The plan view of the construction of the reinforced concrete reaction device provided by the embodiment of the present invention; Figure 15 The longitudinal sectional view of the construction of the reinforced concrete reaction device provided by the embodiment of the present invention; Figure 16 The cross-sectional view of the construction of the reinforced concrete reaction device provided by the embodiment of the present invention; Figure 17 The plan view of the hoisting of the shield machine trolley provided by the embodiment of the present invention; Figure 18 The longitudinal sectional view of the hoisting of the shield machine trolley provided by the embodiment of the present invention; Figure 19 The cross-sectional view of the hoisting of the shield machine trolley provided by the embodiment of the present invention; Figure 20 The plan view of the connection between the shield machine trolley and the shield body provided by the embodiment of the present invention; Figure 21 The longitudinal sectional view of the connection between the shield machine trolley and the shield body provided by the embodiment of the present invention; Figure 22 The cross-sectional view of the connection between the shield machine trolley and the shield body provided by the embodiment of the present invention; Figure 23 The plan view of the start of the shield machine provided by the embodiment of the present invention; Figure 24 The longitudinal sectional view of the start of the shield machine provided by the embodiment of the present invention; Figure 25 The cross-sectional view of the start of the shield machine provided by the embodiment of the present invention; Figure 26 The plan view of the application of the binder provided by the embodiment of the present invention; Figure 27 The longitudinal sectional view of the application of the binder provided by the embodiment of the present invention; Figure 28 The cross-sectional view of the application of the binder provided by the embodiment of the present invention.

[0019] The labels in the drawings and the corresponding component names: 1 - Subway station; 2 - Cut-and-cover tunnel; 3 - Shield tunnel; 4 - Guide platform; 6 - Shield portal; 7 - Bracket; 8 - Shield body; 9 - Reinforced concrete reaction device; 10 - Shield machine trolley; 11 - Negative segment; 12 - Binder. Detailed implementation manners

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. The components of the embodiments of this application usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application that is claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0023] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this application is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0024] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Please refer to Figures 1 to 28 , this application provides a construction method for a shield machine to start tunneling in a mined tunnel without removing the negative ring, including the following steps: S1. Construct the subway station 1, excavate the mined tunnel 2 in the subway station 1, and construct the shield portal 6 at the face of the mined tunnel 2; S2. Install the shield body 8 at the shield portal 6; S3. Construct a ring beam at the shield portal 6, and construct a reinforced concrete reaction device 9 at the tail of the shield body 8 inside the mined tunnel 2; S4. Install a shield machine trolley 10 in the mined tunnel 2 and connect it to the shield body 8 to obtain a shield machine; S5. Start the shield machine to obtain a shield tunnel 3; S6. Demolish the bracket 7, and connect the shield tunnel 3 to the mined tunnel 2 through an adhesive 12.

[0026] The construction method of the shield machine provided in this embodiment for starting in the mined tunnel without demolishing the negative ring, by setting the shield machine at the heading face of the mined tunnel, on this basis, constructing a ring beam at the shield portal, and constructing a reinforced concrete reaction device at the tail of the shield body inside the mined tunnel to replace the conventional reaction frame made of profiled steel, thus fundamentally avoiding the situation of demolishing the negative ring and the reaction frame, so as to solve the problems of small site in the mined tunnel, difficult operation of demolishing the steel structure reaction frame and negative ring, and high safety risk coefficient; by using an adhesive to connect the shield tunnel and the mined tunnel into one body, effectively strengthening the structure on the basis of not demolishing the negative ring and the reaction frame, so as to avoid the problem of segment displacement caused by vibration during the later subway operation; this method can complete the construction of the shield portal in advance, ensure the handover time of the tunnel, not demolishing the negative ring and the reaction frame effectively improves the construction safety factor and operability, and at the same time saves labor and mechanical costs.

[0027] To explain the setting method of the shield body 8, the setting of the shield body 8 at the shield portal 6 includes the following steps: S2.1. Construct a guide platform 4 at one end of the mined tunnel 2 close to the shield portal 6; S2.2. Install a bracket 7 on the guide platform 4, and arrange the shield body 8 at the shield portal 6 through the bracket 7.

[0028] It should be noted that after the primary support and secondary lining of the mined tunnel 2 are completed, the guide platform 4 is constructed to facilitate the later empty pushing of the shield body 8 to the heading face.

[0029] The function of the bracket 7 is to facilitate the hoisting and assembly of the shield body 8 and the shield machine trolley 10.

[0030] To specifically explain the setting method of the bracket 7, the setting of the bracket 7 on the guide platform 4 includes the following steps: S2.2.1. Hoist the bracket 7 in the hoisting shaft of the subway station 1; S2.2.2. Translate the bracket 7 from the subway station 1 to the mined tunnel 2; S2.2.3. Connect the bracket 7 to the guide platform 4.

[0031] For a specific explanation of the installation method of the shield body, the laying of the shield body 8 through the bracket 7 at the shield portal 6 of the shield tunneling machine includes the following steps: S2.2.4. Hoist and place the shield body 8 on the bottom plate of the subway station 1. S2.2.5. Transfer the shield body 8 from the subway station 1 and place it on the bracket 7. S2.2.6. Translate the shield body 8 through the bracket 7 to the guide platform 4. S2.2.7. Push the shield body 8 on the guide platform 4 to the shield portal 6 by empty pushing.

[0032] For a further explanation of the assembly process of the shield tunneling machine, the installation of the shield tunneling machine trolley 10 in the mined tunnel 2 includes the following steps: S4.1. Hoist and place the components of the shield tunneling machine trolley 10 at the hoisting shaft on the bottom plate of the subway station 1, and then assemble to obtain the shield tunneling machine trolley 10. S4.2. Transfer the shield tunneling machine trolley 10 from the subway station 1 and place it on the bracket 7. S4.3. Translate the shield tunneling machine trolley 10 through the bracket 7 to the location where the shield body 8 is located.

[0033] For an explanation of the starting process of the shield tunneling machine, the starting of the shield tunneling machine includes the following steps: S5.1. Drive through the shield tunneling machine. S5.2. Stop driving after the shield tail of the shield tunneling machine passes over the shield portal 6.

[0034] It should be noted that the above construction method for the starting of the shield tunneling machine in the mined tunnel without removing the negative ring also includes the following steps: S5.3. During the starting of the shield tunneling machine, construct negative segment linings 11 in the mined tunnel 2.

[0035] It should be noted that after assembling the negative segment linings 11, a certain amount of binder 12 is pre-filled.

[0036] For a specific explanation of the application position of the binder 12, fill the binder 12 between the negative segment linings 11 and the secondary lining of the mined tunnel 2.

[0037] It should be noted that after filling the binder 12, holes need to be opened to check whether it is filled densely to ensure the integrity of the shield tunnel 3 and the mined tunnel 2.

[0038] For an explanation of the specific composition of the binder 12, the binder 12 is a mixture of pea gravel and mortar.

[0039] To explain the strength of the binder 12, the strength of the binder 12 is 2.5 - 5.0 MPa.

[0040] Example Please refer to Figures 1 to 28 , this embodiment provides a construction method for a shield machine to start tunneling in a mined tunnel without removing the negative ring, including the following steps: (1), Please refer to Figures 2 to 4 , construct the subway station 1, excavate the mined tunnel 2 from the subway station 1, and construct the shield portal 6 at the face of the mined tunnel 2; construct the guide platform 4 at one end of the mined tunnel 2 close to the shield portal 6; (2), Please refer to Figures 5 to 7 , hoist the bracket 7 at the hoisting shaft of the subway station 1, translate the bracket 7 from the subway station 1 to the mined tunnel 2, and connect the bracket 7 with the guide platform 4; (3), Please refer to Figures 8 to 13 , hoist and place the shield body 8 on the floor slab of the subway station 1, transfer the shield body 8 from the subway station 1 and place it on the bracket 7, translate the shield body 8 through the bracket 7 to the guide platform 4, and push the shield body 8 on the guide platform 4 to the shield portal 6; (4), Please refer to Figures 14 to 16 , construct the ring beam at the shield portal 6, and construct the reinforced concrete reaction device 9 at the tail of the shield body 8 in the mined tunnel 2; (5), Please refer to Figures 17 to 22 , hoist and place the components of the shield machine trolley 10 at the hoisting shaft on the floor slab of the subway station 1, then assemble the shield machine trolley 10, transfer the shield machine trolley 10 from the subway station 1 and place it on the bracket 7, translate the shield machine trolley 10 through the bracket 7 to the location of the shield body 8, and connect it with the shield body 8 to obtain the shield machine; (6), Please refer to Figures 23 to 25 , start the shield machine, drive through the shield machine, and stop driving after the shield tail of the shield machine crosses the shield portal 6 to obtain the shield tunnel 3; during the process of starting the shield machine, construct the negative ring segments 11 in the mined tunnel 2; (7), Please refer to Figures 26 to 28 , remove the bracket 7, fill the mixture of pea gravel and mortar between the negative ring segments 11 and the secondary lining of the mined tunnel 2, and connect the shield tunnel 3 with the mined tunnel 2 through the mixture of pea gravel and mortar, where: the strength of the binder 12 is 2.5 - 5.0 MPa.

[0041] The construction method of the shield machine provided in this embodiment for starting the excavation of the hidden tunnel without removing the negative ring can effectively solve the safety risk of removing the negative ring in the narrow space of the hidden tunnel. During the use of this method, a reinforced concrete reaction device 9 is used to replace the traditional steel structure reaction device. At the same time, pea gravel and high-strength mortar are used to fill the second lining structure of the negative ring segment 11 and the hidden tunnel 2, further ensuring the safety of subway operation. This method has successfully solved the problems such as high safety risk coefficient of negative ring removal and great construction difficulty in the hidden tunnel. At the same time, it reduces the construction cost and speeds up the construction progress. It can ensure the starting and efficient tunneling of the shield machine in a more economical, reasonable, safe and effective manner, providing a new idea and specific solution for the construction problems of similar shield machine groups, which is worthy of reference and promotion.

[0042] The specific embodiments described above further elaborate on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A construction method for a shield machine to start tunneling in a mined tunnel without removing the negative ring, characterized in that, The method includes the following steps: Construct a subway station (1), excavate a mined tunnel (2) from the subway station (1), and construct a shield portal (6) at the face of the mined tunnel (2); Install a shield body (8) at the shield portal (6); Construct a ring beam at the shield portal (6), and construct a reinforced concrete reaction device (9) at the tail of the shield body (8) inside the mined tunnel (2); Install a shield machine trolley (10) in the mined tunnel (2) and connect it to the shield body (8) to obtain a shield machine; Start the shield machine to obtain a shield tunnel (3); Remove the bracket (7) and connect the shield tunnel (3) to the mined tunnel (2) through an adhesive (12).

2. The construction method of the shield machine for the initial excavation of the mined - out tunnel without demolishing the negative ring according to claim 1, characterized in that, The step of installing the shield body (8) at the shield portal (6) includes the following steps: Construct a guide platform (4) at one end of the mined tunnel (2) close to the shield portal (6); Install a bracket (7) on the guide platform (4), and arrange the shield body (8) at the shield portal (6) through the bracket (7).

3. The construction method of the shield machine for the initial excavation of the mined - out tunnel without removing the negative ring according to claim 2, characterized in that, The step of installing the bracket (7) on the guide platform (4) includes the following steps: Lift and install the bracket (7) from the hoisting shaft of the subway station (1); Translate the bracket (7) from the subway station (1) to the mined tunnel (2); Connect the bracket (7) to the guide platform (4).

4. The construction method of the shield machine for the initial excavation of the mined tunnel without removing the negative ring according to claim 3, characterized in that The step of arranging the shield body (8) at the shield portal (6) through the bracket (7) includes the following steps: Lift and place the shield body (8) on the floor slab of the subway station (1); Transfer the shield body (8) from the subway station (1) and place it on the bracket (7); Translate the shield body (8) to the guide platform (4) through the bracket (7); Push the shield body (8) on the guide platform (4) to the shield portal (6) by empty pushing.

5. The construction method of the shield machine for the initial excavation of the mined - out tunnel without removing the negative rings according to claim 4, characterized in that The step of installing the shield machine trolley (10) in the mined tunnel (2) includes the following steps: Lift and place the components of the shield machine trolley (10) from the hoisting shaft on the floor slab of the subway station (1), and then assemble to obtain the shield machine trolley (10); Transfer the shield machine trolley (10) from the subway station (1) and place it on the bracket (7); Translate the shield machine trolley (10) to the location of the shield body (8) through the bracket (7).

6. The construction method of the shield machine for the initial excavation of the mined tunnel without removing the negative ring according to claim 1, characterized in that The step of starting the shield machine includes the following steps: Drive the shield machine forward; Stop driving after the shield tail of the shield machine passes over the shield portal (6).

7. The construction method of the shield machine for the initial excavation of the mined tunnel without removing the negative ring according to claim 1, characterized in that The method further includes the following steps: During the process of starting the shield machine, construct a negative ring segment (11) in the mined tunnel (2).

8. The construction method of the shield machine for the initial excavation of the mined tunnel without removing the negative ring according to claim 7, characterized in that Fill the adhesive (12) between the negative ring segment (11) and the secondary lining of the mined tunnel (2).

9. The construction method of the shield machine for the initial excavation of a mined tunnel without removing the negative ring according to claim 8, characterized in that The adhesive (12) is a mixture of pea gravel and mortar.

10. The construction method of the shield machine for the initial excavation of a mined tunnel without removing the negative ring according to claim 1, characterized in that The strength of the adhesive (12) is 2.5 - 5.0 MPa.

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