Construction method of shield tunneling machine for passing through underground excavation tunnel through empty pushing

Abstract

The invention discloses a construction method for a shield tunneling machine to pass through a subsurface tunnel through empty pushing. The construction method comprises the steps that backfilling is conducted on an inverted arch of the subsurface tunnel to form a bottom plate; first guide rails are laid on the two opposite sides, close to the rear section of the receiving hole, of the bottom plate correspondingly, and guide tables are poured on the two opposite sides, away from the front section of the receiving hole, of the bottom plate correspondingly; the hoisting bracket is placed at one end, close to the receiving hole, of each first guide rail; the shield tunneling machine is pushed to the ends, close to the receiving hole, of the two second guide rails on the bracket through the receiving hole; the bracket is pushed forwards by driving the jack and the rail clamping device, so that the shield tunneling machine slides to the other end of the first guide rail; and the counter-force bracket serves as a counter-force supporting point, and the shield tunneling machine is pushed by the jack to slide forwards on the two second guide rails to the two third guide rails till the shield tunneling machine is arranged at the starting position. The shield tunneling machine empty pushing method solves the problem that a traditional shield tunneling machine empty pushing method is high in duct piece purchasing and renting cost and shield tunneling machine empty pushing cost and construction cost.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling construction, and particularly relates to a construction method for a shield machine to push through an excavated tunnel in the air. Background Art

[0002] With the rapid development of subway construction in major cities, the situations of line intersections, under-crossing and side-crossing of buildings are more frequent. At present, the shield machine pushing technology in the air has been relatively mature in the field of shield tunneling construction. However, most of the shield machine pushing in the air uses the shield machine cylinders to push the three large segments of the segment for pushing in the air.

[0003] In the traditional shield machine pushing method in the air, the shield machine cylinders push against the segments for propulsion. It is necessary to purchase segments and then carry out segment hoisting, which incurs costs for segment purchase, rental and shield machine pushing in the air, resulting in relatively high construction costs. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the present invention provides a construction method for a shield machine to push through an excavated tunnel in the air, so as to solve the problems of the traditional shield machine pushing method in the air, such as the costs for segment purchase, rental and shield machine pushing in the air, and relatively high construction costs.

[0005] To achieve the above object, the present invention provides a construction method for a shield machine to push through an excavated tunnel in the air, including the following steps:

[0006] Backfill the invert of the excavated tunnel between the receiving shaft and the launching shaft to form a bottom slab;

[0007] On the relative two sides of the rear section of the bottom slab close to the receiving shaft, lay first guide rails respectively, and on the relative two sides of the front section of the bottom slab far from the receiving shaft, pour and form guide platforms respectively;

[0008] Provide a bracket, hoist and place the bracket on one end of multiple first guide rails close to the receiving shaft. Second guide rails are laid on the relative two sides of the bracket. The two second guide rails are arranged below the tunneling track of the shield machine. Third guide rails are laid on the two guide platforms respectively. The third guide rails are coaxially arranged with the second guide rails;

[0009] The shield machine is advanced through the receiving shaft to one end of the two second guide rails on the bracket close to the receiving shaft;

[0010] Install driving jacks on the bracket, and install rail clamps on the telescopic ends of the driving jacks. Advance the bracket forward through the driving jacks and the rail clamps, so that the shield machine slides to the other end of the first guide rails;

[0011] Fix multiple reaction corbels on the bottom slab. The multiple reaction corbels are arranged at intervals along the length direction of the bottom slab;

[0012] Taking the reaction corbel as the reaction support point, the shield machine is pushed forward by the jacking jacks to slide forward on the two second guide rails to the two third guide rails until the shield machine is set at the starting position.

[0013] Furthermore, the number of the first guide rails arranged on each side of the bottom plate is three.

[0014] Furthermore, the bottom plate is provided with multiple rows of limit steel bars, and the first guide rail is embedded between two rows of limit steel bars.

[0015] Furthermore, the bracket includes:

[0016] Multiple arc-shaped bottom supports arranged at intervals along the length direction of the bottom plate, the inner arc surface of the arc-shaped bottom support is arranged upwards, the relative two ends of the bottom of the arc-shaped bottom support are connected with thickness compensation pieces, the bottom of the thickness compensation piece is flush with the arc top of the outer arc surface of the arc-shaped bottom support, and the thickness compensation piece slides on the first guide rail;

[0017] A connecting beam, which is connected to the multiple arc-shaped bottom supports.

[0018] The beneficial effect of the present invention lies in that the construction method of pushing the shield machine through the mined tunnel empty, compared with the traditional empty pushing method, adjusts the empty pushing method, changes from segment propulsion to jacking the shield machine bracket and using the concrete guide table construction method, reduces the construction risk during the segment hoisting and transportation process, reduces the segment purchase, lease and shield machine empty pushing costs, and at the same time, the specially made shield machine bracket can be reused. The construction method is simple and efficient, shortens the construction period, reduces the construction investment, and has good popularization significance for the shield machine empty pushing construction, especially for long-distance empty pushing construction projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects and advantages of the present application will become more obvious:

[0020] Figure 1 It is a schematic structural diagram of the rear section of the bottom plate of the embodiment of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the front section of the bottom plate of the embodiment of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the bracket of the embodiment of the present invention.

[0023] Figure 4 It is a schematic structural diagram of the top view of the bracket of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and do not limit the invention. In addition, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] Referring to Figures 1 to 4 As shown, the present invention provides a construction method for a shield machine to push through a mined tunnel empty, including the following steps:

[0027] S1. Backfill the invert 1 of the mined tunnel between the receiving shaft and the launching shaft to form a bottom plate 2.

[0028] S2. Lay the first guide rails 3 on the opposite sides of the rear section of the bottom plate 2 close to the receiving shaft, and pour and form guide platforms 4 on the opposite sides of the front section of the bottom plate 2 away from the receiving shaft.

[0029] In this embodiment, the number of the first guide rails 3 provided on each side of the bottom plate 2 is three.

[0030] As a preferred embodiment, the bottom plate 2 is provided with multiple rows of limit steel bars. The first guide rails 3 are embedded between two rows of limit steel bars.

[0031] S3. Provide a bracket 5, hoist and place the bracket 5 on one end of multiple first guide rails 3 close to the receiving shaft. The second guide rails 51 are laid on the opposite sides of the bracket 5. The two second guide rails 51 are arranged below the tunneling track of the shield machine 6. The third guide rails 41 are respectively laid on the two guide platforms 4. The third guide rails 41 and the second guide rails 51 are coaxially arranged.

[0032] Specifically, the bracket 5 includes: an arc-shaped bottom support 52 and a connecting beam 53.

[0033] Among them, the number of the arc-shaped bottom supports 52 is multiple. The multiple arc-shaped bottom supports 52 are arranged at intervals along the length direction of the bottom plate 2. The inner arc surface of the arc-shaped bottom support 52 faces upward. The opposite ends of the bottom of the arc-shaped bottom support 52 are connected with thickness compensation members 54. The bottom of the thickness compensation member 54 is flush with the arc top of the outer arc surface of the arc-shaped bottom support 52. The thickness compensation member 54 slides on the first guide rail 3. The connecting beam 53 is connected to the multiple arc-shaped bottom supports 52.

[0034] S4. The shield machine 6 is advanced through the receiving shaft to one end of the two second guide rails 51 on the bracket 5 close to the receiving shaft.

[0035] S5. Install a driving jack on the bracket 5, and install a rail clamp on the telescopic end of the driving jack. Push the bracket 5 forward through the driving jack and the rail clamp, so that the shield machine 6 slides to the other end of the first guide rail 3.

[0036] S6. Fix a plurality of reaction corbels on the bottom plate 2, and the plurality of reaction corbels are arranged at intervals along the length direction of the bottom plate 2.

[0037] S7. Using the reaction corbels as reaction support points, push the shield machine 6 forward along the two second guide rails 51 to the two third guide rails 41 through the jacking jack until the shield machine 6 is set at the starting position.

[0038] Before the shield machine is pushed forward empty, for the invert backfill of the mined tunnel to the existing bottom plate, check the elevation of the backfilled bottom plate to ensure that the bracket will not be affected by the uneven elevation of the bottom plate in the mined tunnel during the empty push process, resulting in jams during the empty push.

[0039] After that, use the track as the first guide rail for empty push at the construction site. To ensure the smoothness of the push, 3 first guide rails are laid on each side of the bottom plate. The spacing between the first guide rails is 0.2 m, and the length is 6 m. During the laying process of the first guide rail, strictly control the track spacing, and fix it by driving Φ20 mm limit steel bars on both sides of the track to ensure that the first guide rail does not slip during the push process.

[0040] Before installing the bracket, calculate the weight of the bracket. During the hoisting process, strictly control the hoisting of the bracket according to the design center line. The center line of the bracket coincides with the center line of the design line of the shield machine, and the shield machine should fall smoothly onto the bracket.

[0041] Two sets of 100T driving jacks and supporting rail clamps are used for the empty push jacking of the shield machine. Before the push process, carefully check the state of the rail clamps to ensure that the rail clamps will not fall off due to the pushing reaction force during the push process. Before the push, the jacks and the rail clamps are kept at the same level, and the reaction force is transmitted to the rail clamps along the horizontal direction.

[0042] The bracket and the first guide rail have rigid dynamic friction. According to relevant specifications, considering the steel-steel unlubricated sliding friction coefficient, in order to reduce the friction resistance during the push process, butter is applied to the contact surface between the first guide rail and the bracket to ensure smooth pushing.

[0043] When the bracket is pushed to the concrete guide platform, the shield machine is transferred from the bracket push to the concrete guide platform. Using the reaction corbels on the outer side of the shield body as reaction support points, steel plates are welded on both sides of the guide platform, and reaction corbels are welded to replace the rail clamps. It is pushed to the front of the starting tunnel by the top reinforcement jack. The pushing construction work is basically the same as the bracket pushing work. Before pushing to the front of the tunnel, the empty push ends.

[0044] The construction method of pushing the shield machine through the mined tunnel without segment erection of the present invention adjusts the pushing method compared with the traditional method of pushing without segment erection. It changes from segment pushing to jacking the shield machine bracket and using the concrete guide table, reducing the construction risks during the segment hoisting and transportation processes, decreasing the segment purchase, rental and shield machine pushing costs without segment erection. At the same time, due to the feature that the specially made shield machine bracket can be reused, the construction method is simple and efficient, shortening the construction period and reducing the construction investment, which has great popularization significance for the shield machine pushing construction, especially for long-distance pushing construction projects.

[0045] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A shield machine empty push through dark excavation tunnel construction method, characterized in that: The following steps are involved: The dark-excavated tunnel invert between the receiving tunnel and the starting tunnel is backfilled to form a bottom plate; First guide rails are laid on opposite sides of the rear section of the bottom plate close to the receiving hole, and guide platforms are cast on opposite sides of the front section of the bottom plate away from the receiving hole; A bracket is provided, the bracket is hoisted and placed on one end of the plurality of first guide rails close to the receiving hole, second guide rails are laid on opposite sides of the bracket, the two second guide rails are arranged below the tunneling track of the shield machine, and third guide rails are laid on two guide platforms respectively, and the third guide rails are arranged coaxially with the second guide rails; The shield machine is advanced through the receiving hole to one end of the two second guide rails on the bracket close to the receiving hole; A driving jack is installed on the bracket, and a rail clamp is installed on the telescopic end of the driving jack, and the bracket is pushed forward by the driving jack and the rail clamp, so that the shield machine slides to the other end of the first guide rail; A plurality of reaction brackets are fixedly mounted on the bottom plate, and the plurality of reaction brackets are arranged at intervals along the length direction of the bottom plate; With the reaction bull leg as the reaction force support point, the shield machine is pushed by a jacking jack to slide forward on the two second guide rails to the two third guide rails until the shield machine is set at the starting position.

2. The shield machine empty pushing through dark excavation tunnel construction method according to claim 1 is characterized in that: The number of first guide rails arranged on each side of the bottom plate is three.

3. The shield machine empty pushing through dark excavation tunnel construction method according to claim 2 is characterized in that: The bottom plate is provided with a plurality of rows of limiting steel bars, and the first guide rail is embedded between two rows of limiting steel bars.

4. The shield machine empty pushing through dark excavation tunnel construction method according to claim 1 is characterized in that: The bracket comprises: A plurality of arc-shaped bottom brackets are arranged at intervals along the length direction of the bottom plate, the inner arc surface of the arc-shaped bottom bracket is arranged upward, the opposite ends of the bottom of the arc-shaped bottom bracket are connected with thickness compensation pieces, the bottom of the thickness compensation piece is flush with the arc top of the outer arc surface of the arc-shaped bottom bracket, and the thickness compensation piece is slidably arranged on the first guide rail; The connecting beam is connected to the multiple arc-shaped bottom supports.

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